Laggy scrolling in terminal and editor

[Dominick-Peluso-Bose]

Issue Type: Performance Issue

Ever since I got this M1 mac with apple silicon, any scrolling I do in VSCode is super choppy and laggy. To reproduce it on my machine I just need to open an editor with a scrollbar or a terminal with some history and scroll quickly up and down.

VS Code version: Code 1.69.2 (3b889b0, 2022-07-18T16:32:39.000Z)
OS version: Darwin arm64 21.6.0
Restricted Mode: No

System Info

Item	Value
CPUs	Apple M1 Max (10 x 24)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: disabled_off direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_renderer: enabled_on video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled
Load (avg)	2, 4, 5
Memory (System)	32.00GB (4.07GB free)
Process Argv	--crash-reporter-id 227dbe86-494d-463f-bc29-f83d8542fc12
Screen Reader	no
VM	0%

Process Info

CPU %	Mem MB	   PID	Process
   17	   164	  7103	code main
    0	    98	  7106	   gpu-process
    0	    33	  7108	   utility-network-service
    0	   360	  7109	   window (test_legacy_get_recents.py — svc-bmx-adapter-trio)
    0	   197	  7125	   shared-process
    0	    66	  7127	     ptyHost
    0	     0	  7165	       /bin/zsh -l
    0	    66	  7161	     fileWatcher
    0	     0	  7405	     /bin/ps -ax -o pid=,ppid=,pcpu=,pmem=,command=
    0	   360	  7126	   extensionHost
    0	    66	  7230	     /Applications/Visual Studio Code.app/Contents/Frameworks/Code Helper.app/Contents/MacOS/Code Helper --ms-enable-electron-run-as-node /Applications/Visual Studio Code.app/Contents/Resources/app/extensions/json-language-features/server/dist/node/jsonServerMain --node-ipc --clientProcessId=7126
    0	   197	  7238	     /Applications/Visual Studio Code.app/Contents/Frameworks/Code Helper.app/Contents/MacOS/Code Helper --ms-enable-electron-run-as-node /Users/dp1031122/.vscode/extensions/ms-python.vscode-pylance-2022.8.10/dist/server.bundle.js --cancellationReceive=file:b29147689cc6f17bf0ad638db769e1aa6438675d32 --node-ipc --clientProcessId=7126
    0	    98	  7402	   issue-reporter

Workspace Info

|  Window (test_legacy_get_recents.py — svc-bmx-adapter-trio)
|    Folder (svc-bmx-adapter-trio): 181 files
|      File types: yml(30) py(28) json(26) pyc(22) gitignore(5) xml(5) js(4)
|                  md(3) npmrc(2) yaml(2)
|      Conf files: dockerfile(8) package.json(2);

Extensions (11)

Extension	Author (truncated)	Version
prettier-vscode	esb	9.5.0
go	gol	0.35.1
githd	hui	2.3.3
vscode-docker	ms-	1.22.1
python	ms-	2022.10.1
vscode-pylance	ms-	2022.8.10
jupyter	ms-	2022.6.1201981810
jupyter-keymap	ms-	1.0.0
jupyter-renderers	ms-	1.0.9
vsliveshare	ms-	1.0.5669
vscode-yaml	red	1.9.1

A/B Experiments

vsliv368cf:30146710
vsreu685:30147344
python383cf:30185419
vspor879:30202332
vspor708:30202333
vspor363:30204092
vslsvsres303:30308271
pythonvspyl392:30443607
vserr242:30382549
pythontb:30283811
vsjup518:30340749
pythonptprofiler:30281270
vsdfh931cf:30280410
vshan820:30294714
vstes263:30335439
pythondataviewer:30285071
vscod805cf:30301675
binariesv615:30325510
bridge0708:30335490
bridge0723:30353136
vsaa593:30376534
vsc1dst:30438360
pythonvs932:30410667
wslgetstarted:30449410
vscscmwlcmt:30465135
cppdebug:30492333
pylanb8912cf:30529770
vsclangdf:30486550
c4g48928:30535728
dsvsc012:30540252

[Tyriar]

Can you do a performance profile in devtools (Help > Toggle Developer Tools) and upload it here?

[Dominick-Peluso-Bose]

Can you do a performance profile in devtools (Help > Toggle Developer Tools) and upload it here?

Sure, attached.
Profile-20220804T145224.json.zip

[VSCodeTriageBot]

Hey @Tyriar, this issue might need further attention.

@Dominick-Peluso-Bose, you can help us out by closing this issue if the problem no longer exists, or adding more information.

[Tyriar]

There's an abnormal about of garbage collection in that profile which I've never seen before:

[Tyriar]

@Dominick-Peluso-Bose what sort of monitor are you connected to? Could you also open devtools via the Help menu and run window.devicePixelRatio in the console? My guess is your font size is so large that the terminal's texture atlas is thrashing and redrawing all glyphs almost every frame.

[Tyriar]

Upstream issue tracking the texture cap problem: xtermjs/xterm.js#4061

[Tyriar]

This one can only be verified by the @Dominick-Peluso-Bose

[VSCodeTriageBot]

This bug has been fixed in the latest release of VS Code Insiders!

@Dominick-Peluso-Bose, you can help us out by commenting /verified if things are now working as expected.

If things still don't seem right, please ensure you're on version c87fa19 of Insiders (today's or later - you can use Help: About in the command palette to check), and leave a comment letting us know what isn't working as expected.

Happy Coding!

[rzhao271]

I'll mark this issue as verified as part of #172064. @Dominick-Peluso-Bose Please file a new issue if the bug continues to occur on the latest Stable and/or Insiders versions of VS Code.