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GitHub Copilot Chat extension's agent mode, utilizing the Claude Sonnet 4 model, is experiencing extreme performance degradation today—tasks that previously took under five minutes are now taking an hour or more to complete #252947

Closed
@sascharo

Description

@sascharo

Type: Performance Issue

Summary of the Issue:

When operating in agent mode with the Claude Sonnet 4 model I experience significant performance issues today. I observe a dramatic increase in processing time, rendering the feature nearly unusable for time-sensitive tasks. This issue is occurring despite the official GitHub service status page indicating all systems are operational (https://www.githubstatus.com/).

Environment Details:

  • VS Code Version: 1.102.0-insider (user setup)
    • Commit: b68fa59
    • Date: 2025-06-27T05:03:40.827Z
  • GitHub Copilot Chat Extension: v0.29.2025063001 (unchanged from the previous day)
  • GitHub Copilot Plugin: v1.338.1649 (newly updated)
  • Model: Claude Sonnet 4 (in agent mode)
  • OS: Windows_NT x64 10.0.26100

Detailed Description:

The GitHub Copilot Chat extension's agent mode has become exceptionally slow. Operations that were previously completing in a matter of minutes are now extending to an hour or longer. This severe latency significantly hampers developer productivity and disrupts workflows that have come to rely on this functionality.

While the primary GitHub Copilot plugin has been recently updated to version v1.338.1649, it is currently unclear to me if this update is directly related to the performance degradation. The VS Code and Copilot Chat extension versions remain consistent with the previous day's configuration, a period during which performance was nominal.

Modes:

Logs
Trace: c0.openGitRepo#1 success. Elapsed 0.041799999999057036
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/AIAccGameEngine.Viewer/inc/Animation/AnimationTypes.h, attempt=0) started
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/AIAccGameEngine.Viewer/src/Scene/SceneManager.cpp, attempt=0) started
Trace: c0.initialize#4 started
Trace: c0.initialize#4 success. Elapsed 0.20100000000093132
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/AIAccGameEngine.Viewer/CMakeLists.txt, attempt=0) success. Elapsed 336.8077999999987
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/AIAccGameEngine.Viewer/src/Scene/SceneValidator.cpp, attempt=0) started
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/AIAccGameEngine.Viewer/src/Animation/AnimationTypes.cpp, attempt=0) success. Elapsed 339.8246999999992
Trace: CodeSearchRepoTracker.updateRepoStateFromEndpoint(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/external/SDL_gpu_examples). Checking status from endpoint.
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/AIAccGameEngine.Viewer/src/UI/HUD.cpp, attempt=0) started
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/AIAccGameEngine.Viewer/inc/Animation/AnimationManager.h, attempt=0) success. Elapsed 491.4835000000003
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/CMakeLists.txt, attempt=0) started
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/AIAccGameEngine.Viewer/src/Scene/SceneManager.cpp, attempt=0) success. Elapsed 337.34380000000056
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/.gitignore, attempt=0) success. Elapsed 428.91299999999865
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/AIAccGameEngine.Viewer/inc/Animation/AnimationTypes.h, attempt=0) success. Elapsed 376.64110000000073
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/cmake/FindSphinx.cmake, attempt=0) started
Trace: c0.initialize#5 started
Trace: c0.initialize#5 success. Elapsed 0.18950000000040745
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/AIAccGameEngine.Viewer/src/UI/HUD.cpp, attempt=0) success. Elapsed 325.5669999999991
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/AIAccGameEngine.Viewer/src/Scene/SceneValidator.cpp, attempt=0) success. Elapsed 470.0539000000008
Trace: GithubCodeSearchService.getRemoteIndexState(thespydog/sdl_gpu_examples). Found indexed commit: d9924b2ccb89a625209ed0ff93e6dfcbbabb830b.
Trace: CodeSearchRepoTracker.updateRepoStateFromEndpoint(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/external/SDL_gpu_examples). Updating state to Ready.
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/CMakeLists.txt, attempt=0) success. Elapsed 434.91109999999935
Trace: c0.initialize#6 started
Trace: c0.initialize#6 success. Elapsed 0.4475000000002183
Trace: No test results
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/AIAccGameEngine.Viewer/src/Animation/AnimationManager.cpp, attempt=0) success. Elapsed 1689.1110000000008
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/AIAccGameEngine.Viewer/src/Animation/AnimationPlaybackSystem.cpp, attempt=0) success. Elapsed 2747.106599999999
Trace: No test results
Trace: ChunksEndpointEmbeddingComputer.fetchChunksRequest(file:///c%3A/Users/ai-acc/source/repos/AIAccGameEngine.12/cmake/FindSphinx.cmake, attempt=0) success. Elapsed 2499.3155000000006
Trace: WorkspaceChunkEmbeddingIndex.getAllWorkspaceEmbeddings success. Elapsed 3103.7741000000005
Trace: WorkspaceChunkEmbeddingIndex.triggerIndexingOfWorkspace success. Elapsed 3104.5491
Debug: Workspace Chunk Embeddings Index initialized.
Trace: c0.initialize#7 started
Trace: c0.initialize#7 success. Elapsed 0.19909999999981665
Trace: c0.initialize#8 started
Trace: c0.initialize#8 success. Elapsed 0.19989999999961583
Debug: [context keys] Window state change. Needs offline check: false, active: true, focused: false.
Debug: [context keys] Window state change. Needs offline check: false, active: true, focused: true.
Debug: [context keys] Window state change. Needs offline check: false, active: true, focused: false.
Debug: [context keys] Window state change. Needs offline check: false, active: true, focused: true.
Debug: [context keys] Window state change. Needs offline check: false, active: true, focused: false.
Debug: [context keys] Window state change. Needs offline check: false, active: false, focused: false.
Trace: GithubCodeSearchService.getRemoteIndexState(thespydog/sdl_gpu_examples). Found indexed commit: d9924b2ccb89a625209ed0ff93e6dfcbbabb830b.
Debug: [context keys] Window state change. Needs offline check: false, active: true, focused: false.
Debug: [context keys] Window state change. Needs offline check: false, active: true, focused: true.
Debug: [context keys] Window state change. Needs offline check: false, active: true, focused: false.
Debug: [context keys] Window state change. Needs offline check: false, active: false, focused: false.
Debug: [context keys] Window state change. Needs offline check: false, active: true, focused: false.
Debug: [context keys] Window state change. Needs offline check: false, active: true, focused: true.
Request IDs
0e8a55c5-4497-46ed-9e23-3383408e27c0
System Info
Item Value
CPUs Intel(R) Core(TM) Ultra 9 285K (24 x 3686)
GPU Status 2d_canvas: enabled
canvas_oop_rasterization: enabled_on
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_graphite: disabled_off
video_decode: enabled
video_encode: enabled
vulkan: disabled_off
webgl: enabled
webgl2: enabled
webgpu: enabled
webnn: disabled_off
Load (avg) undefined
Memory (System) 95.27GB (58.03GB free)
Process Argv --crash-reporter-id 1ae4b98f-0c1a-4047-9e9b-45b755d2366c
Screen Reader no
VM 0%
Process Info
CPU %	Mem MB	   PID	Process
    0	   177	 34872	code-insiders
    0	    52	  6436	   utility-network-service
    0	   198	  6932	shared-process
    0	    13	 36260	     "c:\Users\ai-acc\AppData\Local\Programs\Microsoft VS Code Insiders\bin\code-tunnel-insiders.exe" tunnel status
    0	     7	 29616	       C:\WINDOWS\system32\conhost.exe 0x4
    0	    32	  7992	   crashpad-handler
    0	   110	 19288	file-watcher [1]
    0	   635	 27500	extension-host [1]
    0	     7	 30528	     C:\WINDOWS\system32\cmd.exe /d /s /c "C:\nvm4w\nodejs\npx.CMD -y tavily-mcp@latest"
    0	     8	  9796	       C:\WINDOWS\system32\conhost.exe 0x4
    0	    82	 30836	       "C:\nvm4w\nodejs\\node.exe"   "C:\nvm4w\nodejs\\node_modules\npm\bin\npx-cli.js" -y tavily-mcp@latest
    0	     7	 35852	         C:\WINDOWS\system32\cmd.exe /d /s /c tavily-mcp
    0	    49	  2720	           electron-nodejs (index.js )
    0	  3012	 31916	     "C:\Program Files\LLVM\bin\clangd.EXE" --compile-commands-dir=./build --background-index --clang-tidy
    0	     7	 18228	       C:\WINDOWS\system32\conhost.exe 0x4
    0	   100	 32984	     "C:\Users\ai-acc\AppData\Local\Programs\Microsoft VS Code Insiders\Code - Insiders.exe" "c:\Users\ai-acc\AppData\Local\Programs\Microsoft VS Code Insiders\resources\app\extensions\markdown-language-features\dist\serverWorkerMain" --node-ipc --clientProcessId=27500
    0	   123	 33136	     "C:\Users\ai-acc\AppData\Local\Programs\Microsoft VS Code Insiders\Code - Insiders.exe" "c:\Users\ai-acc\AppData\Local\Programs\Microsoft VS Code Insiders\resources\app\extensions\json-language-features\server\dist\node\jsonServerMain" --node-ipc --clientProcessId=27500
    0	   151	 33052	   gpu-process
    0	   183	 33572	pty-host
    0	     8	  2116	     conpty-agent
    0	    90	  5724	     "C:\Program Files\PowerShell\7-preview\pwsh.exe" -NoExit -Command "chcp 65001"
    0	   146	  8564	     "C:\Program Files\PowerShell\7-preview\pwsh.exe" -NoProfile -ExecutionPolicy Bypass -Command "Import-Module 'c:\Users\ai-acc\.vscode-insiders\extensions\ms-vscode.powershell-2025.3.1\modules\PowerShellEditorServices\PowerShellEditorServices.psd1'; Start-EditorServices -HostName 'Visual Studio Code Host' -HostProfileId 'Microsoft.VSCode' -HostVersion '2025.3.1' -BundledModulesPath 'c:\Users\ai-acc\.vscode-insiders\extensions\ms-vscode.powershell-2025.3.1\modules' -EnableConsoleRepl -StartupBanner \"PowerShell Extension v2025.3.1
Copyright (c) Microsoft Corporation.

https://aka.ms/vscode-powershell
Type 'help' to get help.
\" -LogLevel 'Warning' -LogPath 'c:\Users\ai-acc\AppData\Roaming\Code - Insiders\logs\20250630T155323\window1\exthost\ms-vscode.powershell' -SessionDetailsPath 'c:\Users\ai-acc\AppData\Roaming\Code - Insiders\User\globalStorage\ms-vscode.powershell\sessions\PSES-VSCode-34872-127016.json' -FeatureFlags @() "
    0	    90	 10604	     "C:\Program Files\PowerShell\7-preview\pwsh.exe" -NoExit -Command "chcp 65001"
    0	     8	 11208	     conpty-agent
    0	     8	 14404	     conpty-agent
    0	     8	 25464	     conpty-agent
    0	     8	 25708	     conpty-agent
    0	    87	 25744	     "C:\Program Files\PowerShell\7-preview\pwsh.exe" -NoExit -Command "chcp 65001"
    0	     8	 26188	     conpty-agent
    0	     8	 30188	     conpty-agent
    0	    88	 31736	     "C:\Program Files\PowerShell\7-preview\pwsh.exe" -NoExit -Command "chcp 65001"
    0	    90	 32284	     "C:\Program Files\PowerShell\7-preview\pwsh.exe" -NoExit -Command "chcp 65001"
    0	    89	 33636	     "C:\Program Files\PowerShell\7-preview\pwsh.exe" -NoExit -Command "chcp 65001"
    0	    89	 34836	     "C:\Program Files\PowerShell\7-preview\pwsh.exe" -NoExit -Command "chcp 65001"
    0	    87	 35284	     "C:\Program Files\PowerShell\7-preview\pwsh.exe" -NoExit -Command "chcp 65001"
    0	     8	 35440	     conpty-agent
    0	     8	 36192	     conpty-agent
    2	  2898	 35272	window [1] (AnimationManager.cpp - AIAccGameEngine.12 - Visual Studio Code - Insiders)
Workspace Info
|  Window (AnimationManager.cpp - AIAccGameEngine.12 - Visual Studio Code - Insiders)
|    Folder (AIAccGameEngine.12): more than 20555 files
|      File types: idx(3322) h(2503) c(1496) cc(1287) cpp(1072) html(843)
|                  obj(674) md(607) png(534) txt(378)
|      Conf files: cmake(302) sln(18) makefile(18) dockerfile(4)
|                  github-actions(1) launch.json(1) mcp.json(1)
|                  settings.json(1) tasks.json(1) csproj(1) package.json(1)
|      Launch Configs: cppdbg(3);
A/B Experiments
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vspor879:30202332
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vspor363:30204092
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pythonvspyt551cf:31249598
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c4g48928:30535728
a9j8j154:30646983
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dsvsc014:30777825
dsvsc015:30821418
2e7ec940:31000449
pythontbext0:30879054
cppperfnew:30980852
dwnewjupytercf:31046870
pythonrstrctxt:31093868
nativeloc1:31118317
e80f6927:31120813
dwcopilot:31158714
c3hdf307:31184662
6074i472:31201624
dwoutputs:31242946
customenabled:31248079
hdaa2157:31222309
copilot_t_ci:31333650
g012b348:31231168
pythoneinst12:31251391
bgtreat:31252123
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6gi0g917:31259950
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pythonrdcb7:31268811
usemplatestapi:31297334
jdghv92:31317040
747dc170:31275146
pythoncompactctx:31296835
6518g693:31302842
generatesymbolt:31280541
convertfstringf:31280702
j97ad248:31306657
usemarketplace:31336439
0g1h6703:31329154
4f60g487:31327383
nes-emitfast-1:31333560
55d1c281:31333312
replacestringexc:31338412
nes-yield-off:31337333
6abeh943:31336334
0c165792:31336556
9c1b2907:31336598
nes-conv-11:31337514

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