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[Performance] vtebench tracking issue #14402

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opened 2026-01-31 04:09:21 +00:00 by claunia · 4 comments
claunia commented 2026-01-31 04:09:21 +00:00
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Originally created by @skyline75489 on GitHub (Jul 6, 2021).

This is an attempt to use vtebench by alacritty to measure & establish the performance baseline of Windows Terminal.

The program itself requires bash so we can only test it through WSL and SSH. Still it shows the real-life performance of this product.

Originally created by @skyline75489 on GitHub (Jul 6, 2021). This is an attempt to use [vtebench](https://github.com/alacritty/vtebench) by alacritty to measure & establish the performance baseline of Windows Terminal. The program itself requires `bash` so we can only test it through WSL and SSH. Still it shows the real-life performance of this product.
claunia added the Issue-FeatureProduct-MetaArea-Performance labels 2026-01-31 04:09:21 +00:00
claunia commented 2026-01-31 04:09:22 +00:00
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@skyline75489 commented on GitHub (Jul 6, 2021):

The result on my PC (WSL 2, AA: grayscale, font: Hack 13pt, Acrylic: off):

1.8.1521.0 
Results:

  cursor_motion (47 samples @ 1.77 MiB):
    213.32ms avg (90% < 215ms) +-1.37ms

  dense_cells (24 samples @ 2.65 MiB):
    421.67ms avg (90% < 443ms) +-23.23ms

  light_cells (143 samples @ 1.08 MiB):
    69.63ms avg (90% < 71ms) +-1ms

  scrolling (2 samples @ 1 MiB):
    4981ms avg (90% < 5004ms) +-32.53ms

  scrolling_bottom_region (1 samples @ 1 MiB):
    102219ms avg (90% < 102219ms) +-0ms

  scrolling_bottom_small_region (1 samples @ 1 MiB):
    101344ms avg (90% < 101344ms) +-0ms

  scrolling_fullscreen (10 samples @ 1 MiB):
    475.6ms avg (90% < 484ms) +-8.55ms

  scrolling_top_region (3 samples @ 1 MiB):
    4595.67ms avg (90% < 4628ms) +-28.36ms

  scrolling_top_small_region (3 samples @ 1 MiB):
    3841ms avg (90% < 3861ms) +-31.24ms

  unicode (27 samples @ 1.06 MiB):
    386.22ms avg (90% < 492ms) +-85.02ms
1.9.1445.0 
Results:

  cursor_motion (87 samples @ 1.3 MiB):
    115.41ms avg (90% < 121ms) +-2.75ms

  dense_cells (44 samples @ 2.02 MiB):
    228.25ms avg (90% < 260ms) +-24.69ms

  light_cells (205 samples @ 1.05 MiB):
    48.4ms avg (90% < 49ms) +-0.78ms

  scrolling (3 samples @ 1 MiB):
    3888.67ms avg (90% < 3942ms) +-48.26ms

  scrolling_bottom_region (1 samples @ 1 MiB):
    59689ms avg (90% < 59689ms) +-0ms

  scrolling_bottom_small_region (1 samples @ 1 MiB):
    60395ms avg (90% < 60395ms) +-0ms

  scrolling_fullscreen (11 samples @ 1 MiB):
    424.18ms avg (90% < 430ms) +-5.42ms

  scrolling_top_region (3 samples @ 1 MiB):
    4367.67ms avg (90% < 4383ms) +-13.87ms

  scrolling_top_small_region (3 samples @ 1 MiB):
    3653.67ms avg (90% < 3672ms) +-16.8ms

  unicode (35 samples @ 1.06 MiB):
    291.54ms avg (90% < 373ms) +-69.71ms
1.10.1933.0 
Results:

  cursor_motion (84 samples @ 1.57 MiB):
    119.35ms avg (90% < 121ms) +-1.05ms

  dense_cells (54 samples @ 2.41 MiB):
    186.07ms avg (90% < 203ms) +-16.97ms

  light_cells (203 samples @ 1.07 MiB):
    48.82ms avg (90% < 50ms) +-0.72ms

  scrolling (2 samples @ 1 MiB):
    4505ms avg (90% < 4535ms) +-42.43ms

  scrolling_bottom_region (1 samples @ 1 MiB):
    85137ms avg (90% < 85137ms) +-0ms

  scrolling_bottom_small_region (1 samples @ 1 MiB):
    80985ms avg (90% < 80985ms) +-0ms

  scrolling_fullscreen (10 samples @ 1 MiB):
    452.2ms avg (90% < 457ms) +-8.53ms

  scrolling_top_region (3 samples @ 1 MiB):
    4474.67ms avg (90% < 4488ms) +-15.28ms

  scrolling_top_small_region (3 samples @ 1 MiB):
    3736.67ms avg (90% < 3831ms) +-84.48ms

  unicode (17 samples @ 1.06 MiB):
    605.24ms avg (90% < 761ms) +-105.16ms

Clearly there's something wrong with scrolling that we need to find out.

zadjii notes circa 1.19

terminal canary 1.20.2683.0 
Results:

  cursor_motion (80 samples @ 1.57 MiB):
    125.46ms avg (90% < 134ms) +-7.91ms

  dense_cells (77 samples @ 2.41 MiB):
    130.75ms avg (90% < 141ms) +-18.29ms

  light_cells (170 samples @ 1.07 MiB):
    58.34ms avg (90% < 61ms) +-2.76ms

  scrolling (5 samples @ 1 MiB):
    2460.6ms avg (90% < 2464ms) +-3.85ms

  scrolling_bottom_region (2 samples @ 1 MiB):
    6726ms avg (90% < 6734ms) +-11.31ms

  scrolling_bottom_small_region (1 samples @ 1 MiB):
    55261ms avg (90% < 55261ms) +-0ms

  scrolling_fullscreen (150 samples @ 1 MiB):
    66.55ms avg (90% < 72ms) +-6.49ms

  scrolling_top_region (5 samples @ 1 MiB):
    2401.4ms avg (90% < 2452ms) +-28.95ms

  scrolling_top_small_region (7 samples @ 1 MiB):
    1508.29ms avg (90% < 1521ms) +-10.4ms

  unicode (128 samples @ 1.06 MiB):
    77.84ms avg (90% < 87ms) +-6.82ms
conhost, 1.19.2682 
Results:

  cursor_motion (120 samples @ 1.01 MiB):
    83.44ms avg (90% < 88ms) +-5.85ms

  dense_cells (214 samples @ 1.08 MiB):
    46.46ms avg (90% < 50ms) +-4.44ms

  light_cells (353 samples @ 1.04 MiB):
    27.82ms avg (90% < 31ms) +-3.07ms

  scrolling (28 samples @ 1 MiB):
    367.54ms avg (90% < 384ms) +-9.45ms

  scrolling_bottom_region (20 samples @ 1 MiB):
    520.05ms avg (90% < 529ms) +-6.14ms

  scrolling_bottom_small_region (10 samples @ 1 MiB):
    1030.5ms avg (90% < 1028ms) +-115.09ms

  scrolling_fullscreen (138 samples @ 1 MiB):
    72.12ms avg (90% < 84ms) +-11.87ms

  scrolling_top_region (8 samples @ 1 MiB):
    1391.13ms avg (90% < 1414ms) +-10.93ms

  scrolling_top_small_region (11 samples @ 1 MiB):
    980.45ms avg (90% < 1000ms) +-17.87ms

  unicode (200 samples @ 1.06 MiB):
    49.59ms avg (90% < 60ms) +-7.46ms
@skyline75489 commented on GitHub (Jul 6, 2021): The result on my PC (WSL 2, AA: grayscale, font: Hack 13pt, Acrylic: off): <details> <summary>1.8.1521.0</summary> ```text Results: cursor_motion (47 samples @ 1.77 MiB): 213.32ms avg (90% < 215ms) +-1.37ms dense_cells (24 samples @ 2.65 MiB): 421.67ms avg (90% < 443ms) +-23.23ms light_cells (143 samples @ 1.08 MiB): 69.63ms avg (90% < 71ms) +-1ms scrolling (2 samples @ 1 MiB): 4981ms avg (90% < 5004ms) +-32.53ms scrolling_bottom_region (1 samples @ 1 MiB): 102219ms avg (90% < 102219ms) +-0ms scrolling_bottom_small_region (1 samples @ 1 MiB): 101344ms avg (90% < 101344ms) +-0ms scrolling_fullscreen (10 samples @ 1 MiB): 475.6ms avg (90% < 484ms) +-8.55ms scrolling_top_region (3 samples @ 1 MiB): 4595.67ms avg (90% < 4628ms) +-28.36ms scrolling_top_small_region (3 samples @ 1 MiB): 3841ms avg (90% < 3861ms) +-31.24ms unicode (27 samples @ 1.06 MiB): 386.22ms avg (90% < 492ms) +-85.02ms ``` </details> <details> <summary>1.9.1445.0</summary> ```text Results: cursor_motion (87 samples @ 1.3 MiB): 115.41ms avg (90% < 121ms) +-2.75ms dense_cells (44 samples @ 2.02 MiB): 228.25ms avg (90% < 260ms) +-24.69ms light_cells (205 samples @ 1.05 MiB): 48.4ms avg (90% < 49ms) +-0.78ms scrolling (3 samples @ 1 MiB): 3888.67ms avg (90% < 3942ms) +-48.26ms scrolling_bottom_region (1 samples @ 1 MiB): 59689ms avg (90% < 59689ms) +-0ms scrolling_bottom_small_region (1 samples @ 1 MiB): 60395ms avg (90% < 60395ms) +-0ms scrolling_fullscreen (11 samples @ 1 MiB): 424.18ms avg (90% < 430ms) +-5.42ms scrolling_top_region (3 samples @ 1 MiB): 4367.67ms avg (90% < 4383ms) +-13.87ms scrolling_top_small_region (3 samples @ 1 MiB): 3653.67ms avg (90% < 3672ms) +-16.8ms unicode (35 samples @ 1.06 MiB): 291.54ms avg (90% < 373ms) +-69.71ms ``` </details> <details> <summary>1.10.1933.0</summary> ```text Results: cursor_motion (84 samples @ 1.57 MiB): 119.35ms avg (90% < 121ms) +-1.05ms dense_cells (54 samples @ 2.41 MiB): 186.07ms avg (90% < 203ms) +-16.97ms light_cells (203 samples @ 1.07 MiB): 48.82ms avg (90% < 50ms) +-0.72ms scrolling (2 samples @ 1 MiB): 4505ms avg (90% < 4535ms) +-42.43ms scrolling_bottom_region (1 samples @ 1 MiB): 85137ms avg (90% < 85137ms) +-0ms scrolling_bottom_small_region (1 samples @ 1 MiB): 80985ms avg (90% < 80985ms) +-0ms scrolling_fullscreen (10 samples @ 1 MiB): 452.2ms avg (90% < 457ms) +-8.53ms scrolling_top_region (3 samples @ 1 MiB): 4474.67ms avg (90% < 4488ms) +-15.28ms scrolling_top_small_region (3 samples @ 1 MiB): 3736.67ms avg (90% < 3831ms) +-84.48ms unicode (17 samples @ 1.06 MiB): 605.24ms avg (90% < 761ms) +-105.16ms ``` </details> Clearly there's something wrong with scrolling that we need to find out. ------------------- zadjii notes circa 1.19 <details> <summary>terminal canary 1.20.2683.0</summary> ``` Results: cursor_motion (80 samples @ 1.57 MiB): 125.46ms avg (90% < 134ms) +-7.91ms dense_cells (77 samples @ 2.41 MiB): 130.75ms avg (90% < 141ms) +-18.29ms light_cells (170 samples @ 1.07 MiB): 58.34ms avg (90% < 61ms) +-2.76ms scrolling (5 samples @ 1 MiB): 2460.6ms avg (90% < 2464ms) +-3.85ms scrolling_bottom_region (2 samples @ 1 MiB): 6726ms avg (90% < 6734ms) +-11.31ms scrolling_bottom_small_region (1 samples @ 1 MiB): 55261ms avg (90% < 55261ms) +-0ms scrolling_fullscreen (150 samples @ 1 MiB): 66.55ms avg (90% < 72ms) +-6.49ms scrolling_top_region (5 samples @ 1 MiB): 2401.4ms avg (90% < 2452ms) +-28.95ms scrolling_top_small_region (7 samples @ 1 MiB): 1508.29ms avg (90% < 1521ms) +-10.4ms unicode (128 samples @ 1.06 MiB): 77.84ms avg (90% < 87ms) +-6.82ms ``` </details> <details> <summary>conhost, 1.19.2682</summary> ``` Results: cursor_motion (120 samples @ 1.01 MiB): 83.44ms avg (90% < 88ms) +-5.85ms dense_cells (214 samples @ 1.08 MiB): 46.46ms avg (90% < 50ms) +-4.44ms light_cells (353 samples @ 1.04 MiB): 27.82ms avg (90% < 31ms) +-3.07ms scrolling (28 samples @ 1 MiB): 367.54ms avg (90% < 384ms) +-9.45ms scrolling_bottom_region (20 samples @ 1 MiB): 520.05ms avg (90% < 529ms) +-6.14ms scrolling_bottom_small_region (10 samples @ 1 MiB): 1030.5ms avg (90% < 1028ms) +-115.09ms scrolling_fullscreen (138 samples @ 1 MiB): 72.12ms avg (90% < 84ms) +-11.87ms scrolling_top_region (8 samples @ 1 MiB): 1391.13ms avg (90% < 1414ms) +-10.93ms scrolling_top_small_region (11 samples @ 1 MiB): 980.45ms avg (90% < 1000ms) +-17.87ms unicode (200 samples @ 1.06 MiB): 49.59ms avg (90% < 60ms) +-7.46ms ``` </details>
claunia commented 2026-01-31 04:09:22 +00:00
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@skyline75489 commented on GitHub (Jul 6, 2021):

For reference this is how Alacritty looks like (private release build, because it requires a fix that has not yet released);

Alacritty on Windows (19043.1083) 
 cursor_motion (13 samples @ 1.3 MiB):
    791.23ms avg (90% < 804ms) +-9.58ms

  dense_cells (7 samples @ 3.86 MiB):
    1534.14ms avg (90% < 1564ms) +-18.87ms

  light_cells (87 samples @ 1 MiB):
    115.08ms avg (90% < 119ms) +-3.1ms

  scrolling (1 samples @ 1 MiB):
    12011ms avg (90% < 12011ms) +-0ms

  scrolling_bottom_region (1 samples @ 1 MiB):
    148788ms avg (90% < 148788ms) +-0ms

  scrolling_bottom_small_region (1 samples @ 1 MiB):
    149490ms avg (90% < 149490ms) +-0ms

  scrolling_fullscreen (4 samples @ 1 MiB):
    1084.5ms avg (90% < 1129ms) +-30.16ms

  scrolling_top_region (1 samples @ 1 MiB):
    13210ms avg (90% < 13210ms) +-0ms

  scrolling_top_small_region (1 samples @ 1 MiB):
    13121ms avg (90% < 13121ms) +-0ms

  unicode (56 samples @ 1.06 MiB):
    180.93ms avg (90% < 186ms) +-6.5ms

Here's some result on several Linux terminals (Ryzen 3600X, X11):

GNOME Terminal 3.36.2 
Results:

  cursor_motion (543 samples @ 1.42 MiB):
    18.1ms avg (90% < 87ms) +-31.44ms

  dense_cells (2 samples @ 4.23 MiB):
    9456ms avg (90% < 9480ms) +-33.94ms

  light_cells (271 samples @ 1.1 MiB):
    36.55ms avg (90% < 122ms) +-50.8ms

  scrolling (45 samples @ 1 MiB):
    223.89ms avg (90% < 290ms) +-44.72ms

  scrolling_bottom_region (57 samples @ 1 MiB):
    177.63ms avg (90% < 293ms) +-64.44ms

  scrolling_bottom_small_region (58 samples @ 1 MiB):
    173.74ms avg (90% < 214ms) +-41.99ms

  scrolling_fullscreen (199 samples @ 1 MiB):
    50.02ms avg (90% < 119ms) +-53.38ms

  scrolling_top_region (57 samples @ 1 MiB):
    176.63ms avg (90% < 204ms) +-43.55ms

  scrolling_top_small_region (58 samples @ 1 MiB):
    174.36ms avg (90% < 211ms) +-38.71ms

  unicode (2 samples @ 1.06 MiB):
    27600.5ms avg (90% < 52888ms) +-35761.93ms
Tilix 1.9.1 
Results:

  cursor_motion (486 samples @ 1.58 MiB):
    20.12ms avg (90% < 88ms) +-32.6ms

  dense_cells (2 samples @ 4.68 MiB):
    7244ms avg (90% < 7511ms) +-377.6ms

  light_cells (280 samples @ 1.04 MiB):
    35.63ms avg (90% < 120ms) +-51.18ms

  scrolling (38 samples @ 1 MiB):
    262.58ms avg (90% < 388ms) +-71.13ms

  scrolling_bottom_region (60 samples @ 1 MiB):
    168.1ms avg (90% < 225ms) +-46.11ms

  scrolling_bottom_small_region (58 samples @ 1 MiB):
    174.28ms avg (90% < 209ms) +-53.11ms

  scrolling_fullscreen (194 samples @ 1 MiB):
    51.41ms avg (90% < 119ms) +-52.85ms

  scrolling_top_region (59 samples @ 1 MiB):
    172.14ms avg (90% < 214ms) +-30.17ms

  scrolling_top_small_region (59 samples @ 1 MiB):
    171.25ms avg (90% < 230ms) +-39.97ms

  unicode (2 samples @ 1.06 MiB):
    19608ms avg (90% < 38354ms) +-26510.85ms
Alacritty 0.8.0 
Results:

  cursor_motion (674 samples @ 1.86 MiB):
    14.41ms avg (90% < 16ms) +-1.01ms

  dense_cells (221 samples @ 5.45 MiB):
    44.87ms avg (90% < 50ms) +-3.19ms

  light_cells (945 samples @ 1.01 MiB):
    10.04ms avg (90% < 11ms) +-0.74ms

  scrolling (95 samples @ 1 MiB):
    105.59ms avg (90% < 113ms) +-26.26ms

  scrolling_bottom_region (103 samples @ 1 MiB):
    96.7ms avg (90% < 110ms) +-12.33ms

  scrolling_bottom_small_region (97 samples @ 1 MiB):
    103.02ms avg (90% < 123ms) +-11.93ms

  scrolling_fullscreen (645 samples @ 1 MiB):
    14.97ms avg (90% < 16ms) +-1.24ms

  scrolling_top_region (100 samples @ 1 MiB):
    99.93ms avg (90% < 119ms) +-13.01ms

  scrolling_top_small_region (94 samples @ 1 MiB):
    106.26ms avg (90% < 124ms) +-29.34ms

  unicode (558 samples @ 1.06 MiB):
    17.3ms avg (90% < 18ms) +-0.84ms

More results on macOS (this is on a 2015 MBP 13, so I use a smaller window size to compensate the less powerful CPU):

iTerm2 3.4.8 
Results:

  cursor_motion (19 samples @ 1.3 MiB):
    533.32ms avg (90% < 639ms) +-69.46ms

  dense_cells (2 samples @ 1.34 MiB):
    8177.5ms avg (90% < 9465ms) +-1820.8ms

  light_cells (55 samples @ 1.04 MiB):
    181.69ms avg (90% < 234ms) +-56.86ms

  scrolling (2 samples @ 1 MiB):
    4470ms avg (90% < 4525ms) +-77.78ms

  scrolling_bottom_region (2 samples @ 1 MiB):
    6804ms avg (90% < 6971ms) +-236.17ms

  scrolling_bottom_small_region (2 samples @ 1 MiB):
    5031.5ms avg (90% < 5064ms) +-45.96ms

  scrolling_fullscreen (14 samples @ 1 MiB):
    132.86ms avg (90% < 144ms) +-13.61ms

  scrolling_top_region (2 samples @ 1 MiB):
    5739.5ms avg (90% < 5772ms) +-45.96ms

  scrolling_top_small_region (2 samples @ 1 MiB):
    5205.5ms avg (90% < 5712ms) +-716.3ms

  unicode (4 samples @ 1.06 MiB):
    2570.25ms avg (90% < 2938ms) +-374.22ms
Terminal.app 2.10 
Results:

  cursor_motion (69 samples @ 1.22 MiB):
    144.86ms avg (90% < 168ms) +-16.69ms

  dense_cells (130 samples @ 1.29 MiB):
    76.64ms avg (90% < 220ms) +-88.1ms

  light_cells (306 samples @ 1 MiB):
    32.24ms avg (90% < 35ms) +-2.66ms

  scrolling (22 samples @ 1 MiB):
    395.05ms avg (90% < 400ms) +-6.5ms

  scrolling_bottom_region (32 samples @ 1 MiB):
    317.81ms avg (90% < 321ms) +-6.44ms

  scrolling_bottom_small_region (32 samples @ 1 MiB):
    319.28ms avg (90% < 324ms) +-15.68ms

  scrolling_fullscreen (88 samples @ 1 MiB):
    39.28ms avg (90% < 46ms) +-3.94ms

  scrolling_top_region (32 samples @ 1 MiB):
    315.91ms avg (90% < 320ms) +-3.25ms

  scrolling_top_small_region (32 samples @ 1 MiB):
    316.84ms avg (90% < 323ms) +-17.3ms

  unicode (238 samples @ 1.06 MiB):
    41.97ms avg (90% < 103ms) +-43.09ms
Alacritty 0.8.0 
Results:

  cursor_motion (300 samples @ 1.25 MiB):
    32.9ms avg (90% < 36ms) +-42.75ms

  dense_cells (97 samples @ 3.79 MiB):
    102.86ms avg (90% < 149ms) +-30.48ms

  light_cells (373 samples @ 1.12 MiB):
    26.35ms avg (90% < 29ms) +-4.36ms

  scrolling (69 samples @ 1 MiB):
    100.38ms avg (90% < 117ms) +-11.05ms

  scrolling_bottom_region (209 samples @ 1 MiB):
    47.44ms avg (90% < 51ms) +-3.15ms

  scrolling_bottom_small_region (85 samples @ 1 MiB):
    117.28ms avg (90% < 123ms) +-4.16ms

  scrolling_fullscreen (145 samples @ 1 MiB):
    28.94ms avg (90% < 31ms) +-1.66ms

  scrolling_top_region (209 samples @ 1 MiB):
    47.47ms avg (90% < 51ms) +-2.65ms

  scrolling_top_small_region (87 samples @ 1 MiB):
    115.32ms avg (90% < 121ms) +-4.15ms

  unicode (276 samples @ 1.06 MiB):
    35.79ms avg (90% < 42ms) +-5.06ms
@skyline75489 commented on GitHub (Jul 6, 2021): For reference this is how Alacritty looks like (private release build, because it requires a fix that has not yet released); <details> <summary>Alacritty on Windows (19043.1083)</summary> ``` cursor_motion (13 samples @ 1.3 MiB): 791.23ms avg (90% < 804ms) +-9.58ms dense_cells (7 samples @ 3.86 MiB): 1534.14ms avg (90% < 1564ms) +-18.87ms light_cells (87 samples @ 1 MiB): 115.08ms avg (90% < 119ms) +-3.1ms scrolling (1 samples @ 1 MiB): 12011ms avg (90% < 12011ms) +-0ms scrolling_bottom_region (1 samples @ 1 MiB): 148788ms avg (90% < 148788ms) +-0ms scrolling_bottom_small_region (1 samples @ 1 MiB): 149490ms avg (90% < 149490ms) +-0ms scrolling_fullscreen (4 samples @ 1 MiB): 1084.5ms avg (90% < 1129ms) +-30.16ms scrolling_top_region (1 samples @ 1 MiB): 13210ms avg (90% < 13210ms) +-0ms scrolling_top_small_region (1 samples @ 1 MiB): 13121ms avg (90% < 13121ms) +-0ms unicode (56 samples @ 1.06 MiB): 180.93ms avg (90% < 186ms) +-6.5ms ``` </details> Here's some result on several Linux terminals (Ryzen 3600X, X11): <details> <summary>GNOME Terminal 3.36.2</summary> ```text Results: cursor_motion (543 samples @ 1.42 MiB): 18.1ms avg (90% < 87ms) +-31.44ms dense_cells (2 samples @ 4.23 MiB): 9456ms avg (90% < 9480ms) +-33.94ms light_cells (271 samples @ 1.1 MiB): 36.55ms avg (90% < 122ms) +-50.8ms scrolling (45 samples @ 1 MiB): 223.89ms avg (90% < 290ms) +-44.72ms scrolling_bottom_region (57 samples @ 1 MiB): 177.63ms avg (90% < 293ms) +-64.44ms scrolling_bottom_small_region (58 samples @ 1 MiB): 173.74ms avg (90% < 214ms) +-41.99ms scrolling_fullscreen (199 samples @ 1 MiB): 50.02ms avg (90% < 119ms) +-53.38ms scrolling_top_region (57 samples @ 1 MiB): 176.63ms avg (90% < 204ms) +-43.55ms scrolling_top_small_region (58 samples @ 1 MiB): 174.36ms avg (90% < 211ms) +-38.71ms unicode (2 samples @ 1.06 MiB): 27600.5ms avg (90% < 52888ms) +-35761.93ms ``` </details> <details> <summary>Tilix 1.9.1</summary> ```text Results: cursor_motion (486 samples @ 1.58 MiB): 20.12ms avg (90% < 88ms) +-32.6ms dense_cells (2 samples @ 4.68 MiB): 7244ms avg (90% < 7511ms) +-377.6ms light_cells (280 samples @ 1.04 MiB): 35.63ms avg (90% < 120ms) +-51.18ms scrolling (38 samples @ 1 MiB): 262.58ms avg (90% < 388ms) +-71.13ms scrolling_bottom_region (60 samples @ 1 MiB): 168.1ms avg (90% < 225ms) +-46.11ms scrolling_bottom_small_region (58 samples @ 1 MiB): 174.28ms avg (90% < 209ms) +-53.11ms scrolling_fullscreen (194 samples @ 1 MiB): 51.41ms avg (90% < 119ms) +-52.85ms scrolling_top_region (59 samples @ 1 MiB): 172.14ms avg (90% < 214ms) +-30.17ms scrolling_top_small_region (59 samples @ 1 MiB): 171.25ms avg (90% < 230ms) +-39.97ms unicode (2 samples @ 1.06 MiB): 19608ms avg (90% < 38354ms) +-26510.85ms ``` </details> <details> <summary>Alacritty 0.8.0</summary> ```text Results: cursor_motion (674 samples @ 1.86 MiB): 14.41ms avg (90% < 16ms) +-1.01ms dense_cells (221 samples @ 5.45 MiB): 44.87ms avg (90% < 50ms) +-3.19ms light_cells (945 samples @ 1.01 MiB): 10.04ms avg (90% < 11ms) +-0.74ms scrolling (95 samples @ 1 MiB): 105.59ms avg (90% < 113ms) +-26.26ms scrolling_bottom_region (103 samples @ 1 MiB): 96.7ms avg (90% < 110ms) +-12.33ms scrolling_bottom_small_region (97 samples @ 1 MiB): 103.02ms avg (90% < 123ms) +-11.93ms scrolling_fullscreen (645 samples @ 1 MiB): 14.97ms avg (90% < 16ms) +-1.24ms scrolling_top_region (100 samples @ 1 MiB): 99.93ms avg (90% < 119ms) +-13.01ms scrolling_top_small_region (94 samples @ 1 MiB): 106.26ms avg (90% < 124ms) +-29.34ms unicode (558 samples @ 1.06 MiB): 17.3ms avg (90% < 18ms) +-0.84ms ``` </details> More results on macOS (this is on a 2015 MBP 13, so I use a smaller window size to compensate the less powerful CPU): <details> <summary>iTerm2 3.4.8</summary> ``` Results: cursor_motion (19 samples @ 1.3 MiB): 533.32ms avg (90% < 639ms) +-69.46ms dense_cells (2 samples @ 1.34 MiB): 8177.5ms avg (90% < 9465ms) +-1820.8ms light_cells (55 samples @ 1.04 MiB): 181.69ms avg (90% < 234ms) +-56.86ms scrolling (2 samples @ 1 MiB): 4470ms avg (90% < 4525ms) +-77.78ms scrolling_bottom_region (2 samples @ 1 MiB): 6804ms avg (90% < 6971ms) +-236.17ms scrolling_bottom_small_region (2 samples @ 1 MiB): 5031.5ms avg (90% < 5064ms) +-45.96ms scrolling_fullscreen (14 samples @ 1 MiB): 132.86ms avg (90% < 144ms) +-13.61ms scrolling_top_region (2 samples @ 1 MiB): 5739.5ms avg (90% < 5772ms) +-45.96ms scrolling_top_small_region (2 samples @ 1 MiB): 5205.5ms avg (90% < 5712ms) +-716.3ms unicode (4 samples @ 1.06 MiB): 2570.25ms avg (90% < 2938ms) +-374.22ms ``` </details> <details> <summary>Terminal.app 2.10</summary> ``` Results: cursor_motion (69 samples @ 1.22 MiB): 144.86ms avg (90% < 168ms) +-16.69ms dense_cells (130 samples @ 1.29 MiB): 76.64ms avg (90% < 220ms) +-88.1ms light_cells (306 samples @ 1 MiB): 32.24ms avg (90% < 35ms) +-2.66ms scrolling (22 samples @ 1 MiB): 395.05ms avg (90% < 400ms) +-6.5ms scrolling_bottom_region (32 samples @ 1 MiB): 317.81ms avg (90% < 321ms) +-6.44ms scrolling_bottom_small_region (32 samples @ 1 MiB): 319.28ms avg (90% < 324ms) +-15.68ms scrolling_fullscreen (88 samples @ 1 MiB): 39.28ms avg (90% < 46ms) +-3.94ms scrolling_top_region (32 samples @ 1 MiB): 315.91ms avg (90% < 320ms) +-3.25ms scrolling_top_small_region (32 samples @ 1 MiB): 316.84ms avg (90% < 323ms) +-17.3ms unicode (238 samples @ 1.06 MiB): 41.97ms avg (90% < 103ms) +-43.09ms ``` </details> <details> <summary>Alacritty 0.8.0</summary> ``` Results: cursor_motion (300 samples @ 1.25 MiB): 32.9ms avg (90% < 36ms) +-42.75ms dense_cells (97 samples @ 3.79 MiB): 102.86ms avg (90% < 149ms) +-30.48ms light_cells (373 samples @ 1.12 MiB): 26.35ms avg (90% < 29ms) +-4.36ms scrolling (69 samples @ 1 MiB): 100.38ms avg (90% < 117ms) +-11.05ms scrolling_bottom_region (209 samples @ 1 MiB): 47.44ms avg (90% < 51ms) +-3.15ms scrolling_bottom_small_region (85 samples @ 1 MiB): 117.28ms avg (90% < 123ms) +-4.16ms scrolling_fullscreen (145 samples @ 1 MiB): 28.94ms avg (90% < 31ms) +-1.66ms scrolling_top_region (209 samples @ 1 MiB): 47.47ms avg (90% < 51ms) +-2.65ms scrolling_top_small_region (87 samples @ 1 MiB): 115.32ms avg (90% < 121ms) +-4.15ms unicode (276 samples @ 1.06 MiB): 35.79ms avg (90% < 42ms) +-5.06ms ```
claunia commented 2026-01-31 04:09:22 +00:00
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@skyline75489 commented on GitHub (Jul 20, 2021):

To summarize the work:

  • #10621 (ConPTY & WT, saves 20%-25% CPU on both sides)
  • #10685 (WT, saves ~20% CPU)
  • #10811 (ConPTY & WT, saves about 10% CPU)
  • #10566 (ConPTY & WT, only useful if other code paths are fast enough)
@skyline75489 commented on GitHub (Jul 20, 2021): To summarize the work: * #10621 (ConPTY & WT, saves 20%-25% CPU on both sides) * #10685 (WT, saves ~20% CPU) * #10811 (ConPTY & WT, saves about 10% CPU) * #10566 (ConPTY & WT, only useful if other code paths are fast enough)
claunia commented 2026-01-31 04:09:23 +00:00
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@skyline75489 commented on GitHub (Jul 23, 2021):

I think I am gonna step down from this project temporarily. So feel free to edit this issue however that may be helpful.

The performance regression in 1.10 is definitely worth investigating. But sadly I don’t have the energy to do that anymore (also my VS just stopped working). What happened in the last month exhausted me more than I could imagine. I need a break from it.

Feel free to At me if there’s some shitty code I wrote that causes troubles. I hope there isn’t too many of them :)

@skyline75489 commented on GitHub (Jul 23, 2021): I think I am gonna step down from this project temporarily. So feel free to edit this issue however that may be helpful. The performance regression in 1.10 is definitely worth investigating. But sadly I don’t have the energy to do that anymore (also my VS just stopped working). What happened in the last month exhausted me more than I could imagine. I need a break from it. Feel free to At me if there’s some shitty code I wrote that causes troubles. I hope there isn’t too many of them :)
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Reference: starred/terminal#14402
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