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[PR #6492] Update _TerminalCursorPositionChanged to use ThrottledFunc #26708

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opened 2026-01-31 09:17:40 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:17:40 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/6492

State: closed
Merged: Yes

Summary of the Pull Request

  • Update _TerminalCursorPositionChanged to use ThrottledFunc.
  • Rename previous ThrottledFunc to ThrottledArgFunc because now ThrottledFunc is for functions that do not take an argument.
  • Update ThrottledFunc and ThrottledArgFunc to accept a CoreDispatcher on which the function should be called for convenience.
  • Don't use coroutines/winrt::fire_and_forget in ThrottledFunc/ThrottledArgFunc because they are too slow (see below).

Performance while displaying a lot of text, in Release mode:

Old code with coroutines:
image

New code without coroutines:
image

References

PR Checklist

  • Closes #xxx
  • CLA signed. If not, go over here and sign the CLA
  • Tests added/passed
  • Requires documentation to be updated
  • I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed

**Original Pull Request:** https://github.com/microsoft/terminal/pull/6492 **State:** closed **Merged:** Yes --- <!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? --> ## Summary of the Pull Request * Update _TerminalCursorPositionChanged to use ThrottledFunc. * Rename previous ThrottledFunc to ThrottledArgFunc because now ThrottledFunc is for functions that do not take an argument. * Update ThrottledFunc and ThrottledArgFunc to accept a CoreDispatcher on which the function should be called for convenience. * Don't use coroutines/winrt::fire_and_forget in ThrottledFunc/ThrottledArgFunc because they are too slow (see below). Performance while displaying a lot of text, in Release mode: Old code with coroutines: ![image](https://user-images.githubusercontent.com/56923875/84574471-ee280d00-ada6-11ea-9332-2b2d48d3c356.png) New code without coroutines: ![image](https://user-images.githubusercontent.com/56923875/84574614-c71e0b00-ada7-11ea-9c92-fce573058413.png) <!-- Other than the issue solved, is this relevant to any other issues/existing PRs? --> ## References <!-- Please review the items on the PR checklist before submitting--> ## PR Checklist * [ ] Closes #xxx * [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA * [ ] Tests added/passed * [ ] Requires documentation to be updated * [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx <!-- Provide a more detailed description of the PR, other things fixed or any additional comments/features here --> ## Detailed Description of the Pull Request / Additional comments <!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well --> ## Validation Steps Performed
claunia added the pull-request label 2026-01-31 09:17:40 +00:00
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Reference: starred/terminal#26708
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