Opening files from command line got very slow very recently

[nguerrera]

Issue Type: Bug

I'm not sure when it started happening, but it was within the last few days so I think there's a recent regression.

Steps to reproduce

1. Start VS Code Insiders as usual
2. Run code-insiders <any file> on the command line

Expected behavior

VS Code opens the file and takes focus relatively quickly

Actual behavior

It takes five or six seconds before VS code has focus with the file open and I can begin to type.

Notes

• The problem reproduces with all extensions disabled (replacing step 1 with code-insiders --disable-extensions)
• It does not reproduce with the stable version of VS Code
• Everything else is performing fine. If I open files from the explorer, it's as instant as ever.
• I tried profiling from developer tools. It doesn't appear to be registering any work during the long delay:

Profile-20200522T144153.zip

VS Code version: Code - Insiders 1.46.0-insider (da98a19, 2020-05-20T22:21:02.272Z)
OS version: Windows_NT x64 10.0.18363

System Info

Item	Value
CPUs	AMD Ryzen Threadripper 1950X 16-Core Processor (32 x 3400)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: disabled_off opengl: enabled_on protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled viz_display_compositor: enabled_on webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	127.88GB (120.58GB free)
Process Argv
Screen Reader	no
VM	0%

Extensions (17)

Extension	Author (truncated)	Version
macros	ctf	0.0.4
vscode-eslint	dba	2.1.5
EditorConfig	Edi	0.15.0
vscode-pull-request-github	Git	0.16.1
vscode-test-explorer	hbe	2.18.1
Lisp	mat	0.1.10
csharp	ms-	1.21.18
remote-wsl	ms-	0.44.2
vsliveshare	ms-	1.0.2236
debugger-for-edge	msj	1.0.14
material-icon-theme	PKi	4.1.0
toggle	reb	0.0.1
vscode-yaml	red	0.8.0
gitconfig	sid	2.0.1
rewrap	stk	1.10.1
emacs-mcx	tut	0.19.6
vscodeintellicode	Vis	1.2.7

[nickcoad]

I don't have anything to add to your very thorough report, other than I've also experienced this on the latest Code Insiders so it's not just you. I'm also not quite sure when it started but it was only the last couple of days max.

[eamodio]

See #97638

[nguerrera]

I'm now seeing extreme lag when typing too, not sure if it's the same root cause. Let me know if there's any details I can share to help determine that.

[nguerrera]

Got an update and this no longer repros. Still having some lagging typing, but I suspect that's altogether separate. I will file something else if it persists.

[deepak1556]

@nguerrera the slowdown was seen with an electron update, we reverted it temporarily. The underlying issue has not been fixed yet. I am reopening to investigate.