microsoft
Substantial delays and missed keystrokes while backspacing in a markdown file
Type: Bug
The repro is inconsistent but occurs routinely throught the day. Best guess at steps:
- Be logged in to GitHub CoPilot.
- Open a markdown file. 2a. Perhaps, let it sit idle for a few minutes.
- Type some text.
- Attempt to erase text with backspace key.
Result: at times, hitting backspace is delayed for over a second and sometimes does not work at all. The CPU fan spins up and I end up fighting with multiple backspace keys to try to delete text. It makes editing markdown almost unusable.
VS Code version: Code 1.100.2 (848b80aeb52026648a8ff9f7c45a9b0a80641e2e, 2025-05-14T21:47:40.416Z) OS version: Windows_NT x64 10.0.26100 Modes:
System Info
| Item | Value |
|---|---|
| CPUs | 12th Gen Intel(R) Core(TM) i9-12900K (24 x 3187) |
| 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) | 127.78GB (82.32GB free) |
| Process Argv | --crash-reporter-id 48f609a6-e1a9-423b-a32a-917d41ef2d95 |
| Screen Reader | no |
| VM | 0% |
Extensions (57)
| Extension | Author (truncated) | Version |
|---|---|---|
| rust-bundle | 1Yi | 1.0.0 |
| midl3-language-server | Ale | 0.0.31 |
| markdown-mermaid | bie | 1.28.0 |
| vscode-dgmlviewer | cod | 2.2.7 |
| doxdocgen | csc | 1.4.0 |
| vulnerability-extension | dev | 1.2025.421002 |
| docker | doc | 0.6.0 |
| xml | Dot | 2.5.1 |
| rust-syntax | dus | 0.6.1 |
| gitlens | eam | 17.1.0 |
| graphviz-preview | EFa | 1.7.5 |
| syntax-highlighter | evg | 0.5.0 |
| dependi | fil | 0.7.15 |
| graphviz-markdown-preview | gee | 0.0.8 |
| copilot | Git | 1.322.0 |
| copilot-chat | Git | 0.27.1 |
| todo-tree | Gru | 0.0.226 |
| vscode-drawio | hed | 1.9.0 |
| better-cpp-syntax | jef | 1.27.1 |
| vscode-graphviz | joa | 0.0.9 |
| rust-doc-viewer | JSc | 4.2.0 |
| rust-flash-snippets | lor | 3.1.1 |
| wavework | Mic | 1.2025.421001 |
| csdevkit | ms- | 1.19.63 |
| csharp | ms- | 2.76.27 |
| vscode-dotnet-runtime | ms- | 2.3.3 |
| vscodeintellicode-csharp | ms- | 2.2.3 |
| debugpy | ms- | 2025.8.0 |
| python | ms- | 2025.6.1 |
| vscode-pylance | ms- | 2025.5.1 |
| sarif-viewer | MS- | 3.4.5 |
| jupyter | ms- | 2025.4.1 |
| jupyter-keymap | ms- | 1.1.2 |
| jupyter-renderers | ms- | 1.1.0 |
| vscode-jupyter-cell-tags | ms- | 0.1.9 |
| vscode-jupyter-slideshow | ms- | 0.1.6 |
| remote-ssh | ms- | 0.120.0 |
| remote-ssh-edit | ms- | 0.87.0 |
| remote-wsl | ms- | 0.99.0 |
| vscode-remote-extensionpack | ms- | 0.26.0 |
| cmake-tools | ms- | 1.20.53 |
| cpptools | ms- | 1.25.3 |
| cpptools-extension-pack | ms- | 1.3.1 |
| hexeditor | ms- | 1.11.1 |
| powershell | ms- | 2025.0.0 |
| remote-explorer | ms- | 0.5.0 |
| remote-server | ms- | 1.5.2 |
| vsliveshare | ms- | 1.0.5948 |
| rust-and-friends | nyx | 1.0.0 |
| rust-targets | Pol | 1.2.1 |
| rust-analyzer | rus | 0.3.2466 |
| claude-dev | sao | 3.16.2 |
| even-better-toml | tam | 0.21.2 |
| vscode-lldb | vad | 1.11.4 |
| rc-script | wil | 1.0.0 |
| markdown-all-in-one | yzh | 3.6.3 |
| rust-mod-generator | Zha | 1.0.10 |
(1 theme extensions excluded)
A/B Experiments
vsliv368:30146709
vspor879:30202332
vspor708:30202333
vspor363:30204092
vscod805:30301674
binariesv615:30325510
c4g48928:30535728
azure-dev_surveyone:30548225
2i9eh265:30646982
962ge761:30959799
h48ei257:31000450
pythontbext0:30879054
cppperfnew:31000557
dwnewjupyter:31046869
pythonrstrctxt:31112756
nativeloc1:31192215
5fd0e150:31155592
dwcopilot:31170013
6074i472:31201624
dwoutputs:31242946
customenabled:31248079
9064b325:31222308
copilot_t_ci:31222730
e5gg6876:31282496
pythoneinst12:31285622
bgtreat:31268568
4gafe986:31271826
c7cif404:31309971
996jf627:31283433
pythonrdcb7cf:31303019
usemplatestapi:31297334
0aa6g176:31307128
7bj51361:31289155
747dc170:31275177
pylancecolorcf:31309109
aj953862:31281341
generatesymbolt:31295002
convertfstringf:31295003
gendocf:31295004
I have an ETW trace that captures the CPU spike in Code.exe. Can share with you if you want. Here is a screenshot of the CPU graph:
So far, it has not reproduced with Insiders build and extensions disabled. Will keep an eye out while finishing some edits on the document.