Vscode: Extremely Slow Typescript VSCode Intellisense

[thiagosantoscunha]

• VSCode Version: 1.39.2
• OS Version: Windows 10 - 1903

Steps to Reproduce:

1. When will I implement Javascript / Typescript code
2. Typescript service keeps loading for a long time

Does this issue occur when all extensions are disabled?: Yes

Extremely Slow Typescript VSCode Intellisense

As per the image above, I have a serious problem with my VSCode intellisense. When I go to inspect a code, it keeps charging for 13 minutes. When the process is over, and I will inspect the implementation of another Javascript code, it goes back to the same process.

The annoying thing is that this has only happened with the Javascript language. I do this in Java or Dart, for example ... and it doesn't happen. It only happens with the Typescript / Javascript language.

I have an amazing workstation and the operating system is up to date and working perfectly.

Windows 10 Operating System - 64bits
Core i7 - 87xxk
16GB Ram Memory - 3200Hz
480GB SSD (OS runs on it and VSCode runs on it) + 10TB Storage (Barracuda)
4GB NVidea Video - 1050TI

My VSCode version always stays up to date.

Note: I've already researched similar issues, which helped to solve is to restart the Typescript Service. But within 2-5 minutes, the problem returns.

[mjbvz]

• Does this reproduce in the latest VS Code insiders build with all extensions disabled?

• Are you using a network drive?

• Does this happen in all projects you open? What about a new folder that just has a single js file in it?

[thiagosantoscunha]

@mjbvz
[_1Does this reproduce in the latest VS Code insiders build with all extensions disabled?_]
Yes! :)

[_Are you using a network drive?_]
I did not quite understand this question. But I am not doing any kind of remote access, or using network resources to code.

[_Does this happen in all projects you open? What about a new folder that just has a single js file in it?_]
This happens with all projects in TS / JS. I haven't opened any simple projects just with JS file yet. But I'll try as soon as I get home!

[Edit]
I got home and create a new workspace, and inside it a 'test.js' project. I ran 5 lines of code for this scenario. But the problem still persists.

[insinfo]

It happened to me too

[francismarcus]

Having the same experience

[houmark]

Also having high CPU (+120%) and also have JS/TS language features sometimes showing for extended time. Disabling the built-in extension and restarting makes CPU normal.

Tested both in VS Code Stable and in Insiders latest.

[mjbvz]

@thiagosantoscunha Can you please follow these instructions to collect performance information. Using the insiders build, reproduce the issue and then share the output of code-insiders --status

[thiagosantoscunha]

@mjbvz
Ok ... grateful for the help!
I will be relocating this weekend, but I will take time for such a procedure.

[panchalkalpesh]

@mjbvz I'm having similar issues with following VS Code versions:

OS: macOS Mojave 10.14.6 (18G95)

Version: 1.39.2
Commit: 6ab598523be7a800d7f3eb4d92d7ab9a66069390
Date: 2019-10-15T15:33:00.827Z
Electron: 4.2.10
Chrome: 69.0.3497.128
Node.js: 10.11.0
V8: 6.9.427.31-electron.0
OS: Darwin x64 18.7.0

Version: 1.40.0-insider
Commit: 33cc09da7a314ea0ee5677d1927739af60d16734
Date: 2019-10-28T11:46:25.634Z
Electron: 6.1.2
Chrome: 76.0.3809.146
Node.js: 12.4.0
V8: 7.6.303.31-electron.0
OS: Darwin x64 18.7.0

Needless to say, my VS Code status bar looks same as @thiagosantoscunha

Process explorer looks like this:

[mjbvz]

@panchalkalpesh Can you please open a new issue

[panchalkalpesh]

@mjbvz Issue #83474 submitted

[mjbvz]

@thiagosantoscunha Did you get chance to collect the additional information?

[zdila]

In our case we have rewritten a project from JS to TS. It is an opensource project which you can get from https://github.com/FreemapSlovakia/freemap-v3-react. Since it is in TS the development is much slower as waiting for intellisense takes often tens of seconds.

[cecodor]

This is happening to me too. Is very frustrating :/

[SupinePandora43]

~~ Performance test ~~
Project https://github.com/SupinePandora43/electron-app
Note: PC#1 and PC#2 uses 1 project harddrive
~ ~ ~ ~
PC#1:
RAM: 2 gb
CPU: 2.2 Ghz 2 Cores
OS: Windows 7 x32 Professional
System HardDrive: HDD, veeery slow
Project HardDrive: HDD, not slow, but not so fast
~ ~ ~ ~
PC#2:
RAM: 4 gb
CPU: 2.8 Ghz 2 Cores
OS: Windows 7 x64 Professional License
System HardDrive: SSD, fast!
Project HardDrive: HDD, not slow, but not so fast
~ ~ ~ ~ ~ ~ ~ ~
file https://github.com/SupinePandora43/electron-app/blob/master/src/App.tsx#L203
results
PC#1: nothing can be displayed loooooooong time, if something displayed - OMG i waited it more 1 min
PC#2: delay between Ctrl+Space and Autocompletions showed up: ~0.3 sec

[misantronic]

I am having the same issue.
It looks like that disabling eslint and tslint-plugin kind of helps.

[lardconcepts]

Same as @misantronic - disabling eslint plugin resolved massive CPU usage when working in remote workspace. Which is a shame as I kind of like eslint but I like outline view, too.

Looks like the problem lies in using eslint and the builtin intellisense plugin together, but one OR the other is OK.

Edit: I spoke to soon - looks like the built in intellisense is still hammering the server when I save the document, and, oddly, when I run a simple node command in the directory from the terminal.

But I also now see that Intellisense doesn't handle ES7 and above - but I would like to know if it's possible to get document outline without the builtin js plugin, or whether eslint plugin can do this?
https://code.visualstudio.com/docs/languages/javascript

[lardconcepts]

Looks like 1GB of memory on the server is not enough - I chucked another 1GB of swap on it, and now it builds up to about 600MB of swap, but once it's done that, everything works perfectly!

[misantronic]

@lardconcepts how do you do that?

[lardconcepts]

@misantronic - well, on Ubuntu it looks like this. This assumes you have no swap in the first place. Give it a try and let me know if it helps, but don't blame me if you screw your system up! Be careful :)

sudo fallocate -l 1024M /swapfile
ls -lh /swapfile
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
sudo swapon -s
sudo nano /etc/fstab

add the following line at the end

/swapfile   none    swap    defaults    0   0

Then save. Might need to reboot. Good luck!

[mjbvz]

Have not heard back from @thiagosantoscunha so closing this issue

Please open separate issues if you are still running into problems

[RobertB4]

I recently updated to the latest version after using 1.32.3 for a long time exactly because of this issue. It was ok for a while but in the past few days intellisense has been really slow, so I downgraded back to 1.32.3. Any later version seems to slow down intellisense for me. I am not sure why, but for now I'll stick to 1.32.3.

[cdeutsch]

1.32.3 does seem way faster.

Unfortunately for me a bunch of extensions rely on newer versions of VS Code.

This is the top result on Google so not sure why this issue is closed. VS Code is so slow it's almost unusable for me right now.

Just tried 1.4.2 and it's faster than 1.37.1 which I was on.

[arnotes]

takes 5 seconds for me to load typescript intellisense everytime I ctrl+space

[fullofcaffeine]

Going through the same on Linux Mint. Intellisense is so slow it's affecting my productivity.