diff --git a/src/cascadia/TerminalSettingsEditor/Extensions.xaml b/src/cascadia/TerminalSettingsEditor/Extensions.xaml
index 84c191bde3..0abace8053 100644
--- a/src/cascadia/TerminalSettingsEditor/Extensions.xaml
+++ b/src/cascadia/TerminalSettingsEditor/Extensions.xaml
@@ -100,7 +100,7 @@
                                Margin="0,4,0,0"
                                HorizontalAlignment="Stretch"
                                HorizontalContentAlignment="Stretch"
-                               Header="{x:Bind Fragment.JsonSource}">
+                               Header="{x:Bind Fragment.Filename}">
                     <ScrollViewer Style="{StaticResource CodeBlockScrollViewerStyle}">
                         <TextBlock Style="{StaticResource CodeBlockStyle}"
                                    Text="{x:Bind Fragment.Json}" />
diff --git a/src/cascadia/TerminalSettingsModel/CascadiaSettings.cpp b/src/cascadia/TerminalSettingsModel/CascadiaSettings.cpp
index c00418652d..6f215ab38e 100644
--- a/src/cascadia/TerminalSettingsModel/CascadiaSettings.cpp
+++ b/src/cascadia/TerminalSettingsModel/CascadiaSettings.cpp
@@ -114,27 +114,10 @@ Model::CascadiaSettings CascadiaSettings::Copy() const
         settings->_allProfiles = winrt::single_threaded_observable_vector(std::move(allProfiles));
         settings->_activeProfiles = winrt::single_threaded_observable_vector(std::move(activeProfiles));
 
-        // copy fragment extensions
-        {
-            std::vector<Model::FragmentSettings> fragmentExtensions;
-            fragmentExtensions.reserve(_fragmentExtensions.Size());
-            for (const auto& fragment : _fragmentExtensions)
-            {
-                fragmentExtensions.emplace_back(get_self<FragmentSettings>(fragment)->Copy());
-            }
-            settings->_fragmentExtensions = winrt::single_threaded_vector(std::move(fragmentExtensions));
-        }
-
-        // copy dynamic profile generators
-        {
-            std::vector<Model::FragmentSettings> dynamicProfileGenerators;
-            dynamicProfileGenerators.reserve(_dynamicProfileGeneratorExtensions.Size());
-            for (const auto& fragment : _dynamicProfileGeneratorExtensions)
-            {
-                dynamicProfileGenerators.emplace_back(get_self<FragmentSettings>(fragment)->Copy());
-            }
-            settings->_dynamicProfileGeneratorExtensions = winrt::single_threaded_vector(std::move(dynamicProfileGenerators));
-        }
+        // fragment extensions and dynamic profile generators don't need a deep clone
+        // because they're fully immutable. We can just copy the reference over instead.
+        settings->_fragmentExtensions = _fragmentExtensions;
+        settings->_dynamicProfileGeneratorExtensions = _dynamicProfileGeneratorExtensions;
     }
 
     // load errors
@@ -153,46 +136,6 @@ Model::CascadiaSettings CascadiaSettings::Copy() const
     return *settings;
 }
 
-Model::FragmentSettings FragmentSettings::Copy() const
-{
-    auto fragment{ winrt::make_self<FragmentSettings>(_source, _json, _jsonSource, _scope) };
-
-    if (_modifiedProfiles)
-    {
-        std::vector<Model::FragmentProfileEntry> modifiedProfiles;
-        modifiedProfiles.reserve(_modifiedProfiles.Size());
-        for (const auto& entry : _modifiedProfiles)
-        {
-            modifiedProfiles.emplace_back(winrt::make<FragmentProfileEntry>(entry.ProfileGuid(), entry.Json()));
-        }
-        fragment->_modifiedProfiles = winrt::single_threaded_vector(std::move(modifiedProfiles));
-    }
-
-    if (_newProfiles)
-    {
-        std::vector<Model::FragmentProfileEntry> newProfiles;
-        newProfiles.reserve(_newProfiles.Size());
-        for (const auto& entry : _newProfiles)
-        {
-            newProfiles.emplace_back(winrt::make<FragmentProfileEntry>(entry.ProfileGuid(), entry.Json()));
-        }
-        fragment->_newProfiles = winrt::single_threaded_vector(std::move(newProfiles));
-    }
-
-    if (_colorSchemes)
-    {
-        std::vector<Model::FragmentColorSchemeEntry> colorSchemes;
-        colorSchemes.reserve(_colorSchemes.Size());
-        for (const auto& entry : _colorSchemes)
-        {
-            colorSchemes.emplace_back(winrt::make<FragmentColorSchemeEntry>(entry.ColorSchemeName(), entry.Json()));
-        }
-        fragment->_colorSchemes = winrt::single_threaded_vector(std::move(colorSchemes));
-    }
-
-    return *fragment;
-}
-
 // Method Description:
 // - Finds a profile that matches the given GUID. If there is no profile in this
 //      settings object that matches, returns nullptr.
diff --git a/src/cascadia/TerminalSettingsModel/CascadiaSettings.h b/src/cascadia/TerminalSettingsModel/CascadiaSettings.h
index d01999559e..059169fb36 100644
--- a/src/cascadia/TerminalSettingsModel/CascadiaSettings.h
+++ b/src/cascadia/TerminalSettingsModel/CascadiaSettings.h
@@ -243,18 +243,16 @@ namespace winrt::Microsoft::Terminal::Settings::Model::implementation
     struct FragmentSettings : FragmentSettingsT<FragmentSettings>
     {
     public:
-        FragmentSettings(hstring source, hstring json, hstring jsonSource, FragmentScope scope) :
+        FragmentSettings(hstring source, hstring json, hstring filename, FragmentScope scope) :
             _source{ source },
             _json{ json },
-            _jsonSource{ jsonSource },
+            _filename{ filename },
             _scope{ scope } {}
 
-        Model::FragmentSettings Copy() const;
-
         hstring Source() const noexcept { return _source; }
         FragmentScope Scope() const noexcept { return _scope; }
         hstring Json() const noexcept { return _json; }
-        hstring JsonSource() const noexcept { return _jsonSource; }
+        hstring Filename() const noexcept { return _filename; }
         Windows::Foundation::Collections::IVector<Model::FragmentProfileEntry> ModifiedProfiles() const noexcept { return _modifiedProfiles; }
         void ModifiedProfiles(const Windows::Foundation::Collections::IVector<Model::FragmentProfileEntry>& modifiedProfiles) noexcept { _modifiedProfiles = modifiedProfiles; }
         Windows::Foundation::Collections::IVector<Model::FragmentProfileEntry> NewProfiles() const noexcept { return _newProfiles; }
@@ -270,7 +268,7 @@ namespace winrt::Microsoft::Terminal::Settings::Model::implementation
     private:
         hstring _source;
         hstring _json;
-        hstring _jsonSource;
+        hstring _filename;
         FragmentScope _scope;
         Windows::Foundation::Collections::IVector<Model::FragmentProfileEntry> _modifiedProfiles;
         Windows::Foundation::Collections::IVector<Model::FragmentProfileEntry> _newProfiles;
diff --git a/src/cascadia/TerminalSettingsModel/CascadiaSettings.idl b/src/cascadia/TerminalSettingsModel/CascadiaSettings.idl
index 5671ed21d4..17d2da2540 100644
--- a/src/cascadia/TerminalSettingsModel/CascadiaSettings.idl
+++ b/src/cascadia/TerminalSettingsModel/CascadiaSettings.idl
@@ -83,7 +83,7 @@ namespace Microsoft.Terminal.Settings.Model
         String Source { get; };
         FragmentScope Scope { get; };
         String Json { get; };
-        String JsonSource { get; };
+        String Filename { get; };
         Windows.Foundation.Collections.IVectorView<FragmentProfileEntry> ModifiedProfilesView { get; };
         Windows.Foundation.Collections.IVectorView<FragmentProfileEntry> NewProfilesView { get; };
         Windows.Foundation.Collections.IVectorView<FragmentColorSchemeEntry> ColorSchemesView { get; };