intellisense become very slow using 1.24.1

[yibn2008]

Issue Type: Performance Issue

When I upgrade to v1.24.1, intellisense become very slow and code syntax highlights are also slow than previous version

VS Code version: Code 1.24.1 (24f6262, 2018-06-13T17:41:50.128Z)
OS version: Darwin x64 17.4.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-5250U CPU @ 1.60GHz (4 x 1600)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: enabled rasterization: enabled video_decode: enabled video_encode: enabled vpx_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	3, 3, 3
Memory (System)	8.00GB (0.30GB free)
Process Argv	/Applications/Visual Studio Code.app/Contents/MacOS/Electron
Screen Reader	no
VM	0%

Process Info

CPU %	Mem MB	   PID	Process
   13	   123	   869	code main
    0	   106	   871	   gpu-process
    0	    74	   873	   shared-process
    0	   369	  6404	   window (SyncFlowRepo.jsx — just-webui)
    0	    82	  6407	     extensionHost
   95	   311	  6411	       electron_node electronForkStart.js tsserver.js 
    0	    49	  6425	         electron_node typingsInstaller.js tsserver.js typesMap.js 
    0	    41	  6408	     watcherService
    1	    74	  6588	   shared-process
    0	     0	  6591	   /bin/ps -ax -o pid=,ppid=,pcpu=,pmem=,command=
    0	     0	  6592	   /bin/ps -ax -o pid=,ppid=,pcpu=,pmem=,command=

Workspace Info

|  Window (SyncFlowRepo.jsx — just-webui)
|    Folder (just-webui): 413 files
|      File types: js(117) scss(73) jsx(49) vm(38) html(26) json(25) css(15)
|                  md(13) tpl(8) woff(6)
|      Conf files: package.json(12) webpack.config.js(1);

Extensions (4)

Extension	Author (truncated)	Version
EditorConfig	Edi	0.12.4
hjson	lak	0.3.0
vscode-language-pack-zh-hans	MS-	1.24.3
js-jsx-snippets	sky	0.0.9

[yibn2008]

I have downgraded to 1.23.1, and the fast intelliSense comes back again :)

Even though I have totally uninstall all extensions and reinstalled 1.24.1, the intelliSense still very slow (some time doesn't work). It seems only 1.23.1 (or earlier version) works on my Mac.

[mjbvz]

@yibn2008

• What type of code are you working in? Does a specific action trigger this?
• Do you see this in VS Code insiders?
• Please share an example project that demonstrates the issue

[peabnuts123]

I want to add a +1 to this. in 1.24.1, my Intellisense in JavaScript dies every ~30 seconds or so. Running TypeScript: Restart TS Server resolves the issue (once it restarts), but it will die again a short while later. Downgrading to 1.23.1 has resolved for now.
I am working in an EmberJS project with nothing that crazy going on, only a few tens of files, so it should be fairly reproducible with not much effort. I have a fair few extensions, so it could be related to that. I have not tested with extensions disabled yet.

EDIT: Hmm I would like to change my input to "tentative" as I am still encountering some issues on 1.23.1, so perhaps it is just the project I am working on.

[yibn2008]

@mjbvz I am working on a React and NodeJS project, it's a large project that contains over 200 source files (NodeJS and React with ES6 and jsx support) and more than 80 dependencies. When I type codes like div>xxx>yyy, the emmet hints doesn't appear immediately, but after a few seconds.

I tried to reproduce on some large React/NodeJS open source projects, but the results are not stable. I noticed that the "Code Helper" process will occupy a high CPU (almost 100%) when intellisense doesn't work

[anaetrezve]

Same problem here. Emmet, prettier not working & very high CPU using even after close VS Code it still uses high CPU. It stops after end process from task manager in windows 10.

[mflux]

This may have something to do with VS Code type checking stuff that was previously opened and now closed. Before this version, Code would stop checking files that have been closed. Now it keeps the problems report around even if you didn't want to.

On top of this, the exclude glob doesn't seem to be working.

[anaetrezve]

I have got the reason. This is because of "Auto Rename Tag" extension. After disabling it, now I don't see that problem.

[arthurlockman]

I have this problem too on both Windows and Mac, but only when working with JS/TS projects. My netcore projects seem to work fine. I'd be happy to contribute any debugging data to help debug.

[mjbvz]

@yibn2008 Are you seeing this in VS Code insiders with all extensions disabled? Do you have an small example project that you can share

[arthurlockman]

I believe I've found the offending extension: https://marketplace.visualstudio.com/items?itemName=rbbit.typescript-hero

Uninstalling this one fixed it for me (I think).

[ma-zal]

I fixed the performance issue by uninstalling Angular Essentials (ID johnpapa.angular-essentials) extension pack for VS code.

Part of mentioned package is Path Intellisense (ID christian-kohler.path-intellisense) extension. When I tried to install it separately, it also causes the slow down.

[mjbvz]

Closing as we have not heard back from original issue opener on if this reproduces in VS Code insiders with all extensions disabled

[herrdu]

我有个想法：vscode 可以根据不同的项目选择加载不同的插件； go项目加载go相关的插件，web项目加载web相关的插件。 你们觉得怎么样？