chat thinking so slow after update vscode to latest version

[gaoyangxiaozhu]

Type: Performance Issue

it is easy reproduce，any prompt would causes it hung in working lots time

ridiculous

VS Code version: Code 1.110.0 (0870c2a, 2026-03-04T01:20:28.863Z)
OS version: Windows_NT x64 10.0.26200
Modes:

System Info

Item	Value
CPUs	13th Gen Intel(R) Core(TM) i9-13900K (32 x 2995)
GPU Status	2d_canvas: enabled GPU0: VENDOR= 0x8086, DEVICE=0xa780 [Intel(R) UHD Graphics 770], DRIVER_VENDOR=Intel, DRIVER_VERSION=32.0.101.7077 ACTIVE GPU1: VENDOR= 0x10de, DEVICE=0x1ff2 [NVIDIA T400 4GB], DRIVER_VERSION=32.0.15.7344 GPU2: VENDOR= 0x8086, DEVICE=0xa780 [Intel(R) UHD Graphics 770], DRIVER_VERSION=32.0.101.7077 GPU3: VENDOR= 0x1414, DEVICE=0x008c [Microsoft Basic Render Driver], DRIVER_VERSION=10.0.26100.7309 Machine model name: Machine model version: 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 trees_in_viz: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	127.70GB (57.43GB free)
Process Argv	--crash-reporter-id 8954570d-01e3-4e8d-848c-8e7e377a7ca6
Screen Reader	no
VM	0%

Extensions (76)

Extension	Author (truncated)	Version
chrome-extension-developer-tools	aar	2.1.0
claude-code	Ant	2.1.70
azurite	Azu	3.35.0
vscode-django	bat	1.15.0
ruff	cha	2026.36.0
esbuild-problem-matchers	con	0.0.3
doxdocgen	csc	1.4.0
copilot-cli-extension	dar	3.3.1
ini-for-vscode	Dav	0.0.4
vscode-eslint	dba	3.0.24
vulnerability-extension	dev	1.2026.304002
python-environment-manager	don	1.2.7
python-extension-pack	don	1.7.0
prettier-vscode	esb	12.3.0
copilot-chat	Git	0.38.1
vscode-pull-request-github	Git	0.130.0
better-cpp-syntax	jef	1.27.1
agent-maestro	Joo	2.8.3
cmake-language-support-vscode	jos	0.0.9
vsc-python-indent	Kev	1.21.0
vscode-catch2-test-adapter	mat	4.22.0
vscode-azure-github-copilot	ms-	1.0.173
vscode-azure-mcp-server	ms-	1.0.1
vscode-azurefunctions	ms-	1.20.3
vscode-azureresourcegroups	ms-	0.12.2
csdevkit	ms-	2.10.3
csharp	ms-	2.120.3
vscode-dotnet-modernize	ms-	0.1.567
vscode-dotnet-runtime	ms-	3.0.0
data-workspace-vscode	ms-	0.6.3
mssql	ms-	1.40.0
sql-bindings-vscode	ms-	0.4.1
sql-database-projects-vscode	ms-	1.5.7
debugpy	ms-	2025.18.0
isort	ms-	2025.0.0
python	ms-	2026.2.0
vscode-pylance	ms-	2026.1.1
vscode-python-envs	ms-	1.20.1
datawrangler	ms-	1.24.0
jupyter	ms-	2025.9.1
jupyter-keymap	ms-	1.1.2
jupyter-renderers	ms-	1.3.0
vscode-jupyter-cell-tags	ms-	0.1.9
vscode-jupyter-slideshow	ms-	0.1.6
remote-containers	ms-	0.447.0
remote-wsl	ms-	0.104.3
cmake-tools	ms-	1.22.28
cpp-devtools	ms-	0.3.6
cpptools	ms-	1.30.5
cpptools-extension-pack	ms-	1.5.1
debug-value-editor	ms-	0.2.2
extension-test-runner	ms-	0.0.14
makefile-tools	ms-	0.12.17
powershell	ms-	2025.4.0
ts-file-path-support	ms-	1.0.0
web-editors	ms-	0.3.0
autodocstring	njp	0.6.1
oxc-vscode	oxc	1.48.0
java	red	1.53.0
vscode-yaml	red	1.21.0
scala	sca	0.5.9
synapse	Syn	1.18.1
ms-teams-vscode-extension	Tea	6.4.3
cmake	twx	0.0.17
vscode-lldb	vad	1.11.4
explorer	vit	1.44.2
migrate-java-to-azure	vsc	1.13.0
vscode-gradle	vsc	3.17.2
vscode-java-debug	vsc	0.58.5
vscode-java-dependency	vsc	0.27.0
vscode-java-pack	vsc	0.30.5
vscode-java-test	vsc	0.44.0
vscode-java-upgrade	vsc	2.0.2
vscode-maven	vsc	0.45.1
jinja	who	0.0.8
clang-format	xav	1.9.0

(1 theme extensions excluded)

A/B Experiments

vsliv368:30146709
vswsl492cf:30256860
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
471b6256:31240254
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
6518g693:31463988
aj953862:31281341
6abeh943:31336334
envsdeactivate2:31464701
cloudbuttont:31379625
aihoversummaries_t:31469308
3efgi100_wstrepl:31403338
use-responses-api:31390855
je187915:31401257
ec5jj548:31422691
metis_rerank_treatment1:31422731
cp_cls_t_966_ss:31454198
a9239246:31458807
4je02754:31466945
ge8j1254_inline_auto_hint_haiku:31431912
nes-autoexp-10:31446583
a5gib710:31434435
00h15499_gpt_53_codex:31464539
7a04d226_do_not_restore_last_panel_session:31438103
31c7i317_no_change:31465101
cp_cls_c_1081:31454833
copilot-nes-oct-trt:31432596
ia-use-proxy-models-svc:31452481
a43f0576c:31442824
e9c30283:31461165
test_treatment2:31471001
nes-conv-2-3:31462665
g_63ac8346:31467999
9c05b404_max_request_50:31468594
idci7584:31464702
edit_mode_hidden:31461530
showstats:31457174
864ei723_large_tool_results_to_disk:31460878
showingstats:31471631
55364912:31471672
7ef87755:31458076
nes-extended-on:31455476
chat:31457767
0h66b693:31471929
2ab5e849:31470126
nes-rcnt-prop:31471616
thinking_effort_h:31471653
f0268191:31471593
thinking_c:31471065

[vs-code-engineering]

Thanks for creating this issue! We figured it's missing some basic information or in some other way doesn't follow our issue reporting guidelines. Please take the time to review these and update the issue.

For Copilot Issues, be sure to visit our Copilot-specific guidelines page for details on the necessary information.

Happy Coding!

[briceruzand]

Same issue

Trace-20260306T154842.json.gz

Version: 1.110.0
Commit: 0870c2a0c7c0564e7631bfed2675573a94ba4455
Date: 2026-03-04T01:20:28.863Z
Electron: 39.6.0
ElectronBuildId: 13330601
Chromium: 142.0.7444.265
Node.js: 22.22.0
V8: 14.2.231.22-electron.0
OS: Linux x64 6.8.0-101-generic

GitHub.copilot-chat : v0.38.1

When the Copilot agent (specifically using Claude Sonnet 4.6) generates a "thinking" block, the VS Code Extension Host and Main Thread experience severe lag. CPU usage spikes to 100%, making the entire editor unresponsive until the thinking process completes.
I close chat panel, copilot is going well in background.

Performance profiling indicates that the bottleneck seems to be located within the chat tree-rendering logic. The streaming of "thought" tokens triggers an excessive number of layout recalculations.

• Primary Culprit: updateThinking
• Downstream Bottleneck: syncDimensionsAndScheduleScroll

[drewclifton]

There definitely seem to be performance issues in latest versions. It's absolutely horrible when on Remote - SSH mode. Even submitting a message is delayed.

But yes, I have seen it just sit on "Working" for example indefinitely with no apparent reason (not even a big ask at the time).

Something funky is going on.

[briceruzand]

I am using it also in remote (devcontainer)

[vs-code-engineering]

This issue has been closed as it has been labeled with info-needed and has not received the additional information that was requested from the issue author. It has been labeled as info-needed for 7 days.

[cyk2018]

It seems the problem still.

[maksimr]

Last two weeks VSCode is painfully slow, especially in remote development. Looks like the problem in copilot-chat extension that slowdown whole interface

[veneridesign]

VS code is unusable, laggy ..... dead...basically a joke.
Still no urgent upgrades are available???????