Vscode-ng-language-service: Intellisense works very slowly

[anna-zhernovkova]

We have a package of about 200 components with 50 attributes in each. Execution of each action takes from several seconds up to a minute.  

The language-service package's version is 2.4.9
Extension version is 0.0.12
Project for reproduce - intellisense-test.zip

Steps to reproduce:

1. Install packages.
2. Go to src/app/app.component.html.
3. Type "
4. Select the "dx-button" component after loading components.
5. Close the new tag and try to type a new attribute for it (for example, "(onClick)") <- a delay will occur.

[chuckjaz]

PR https://github.com/angular/angular/pull/15543 address this. It should make it to a release by Wednesday or Thursday.

[chuckjaz]

Improved in 0.1.1. I will close this for now but I plan to continue to work on performance in this area.

[nasreddineskandrani]

@chuckjaz
Hi,
ctrl + click is not working proprely (slow) in 3 differents code base i used for 3 real products using angular.
I decided to investigate and i found that the problem is coming from vscode-ng-language-service (i referenced the issue from vscode repo https://github.com/Microsoft/vscode/issues/53541)

Since i can't share the code of the 3 private repos. I decided to hunt for a way to reproduce it in a public repo and i found one.

So the steps to reproduce are:

• clone repo https://github.com/stefanoslig/angular-ngrx-nx-realworld-example-app
• yarn install
• did some ctrl + click and the slowness shows when:
  -- apps\conduit\src\app\app.component.spec.ts
  ctrl + click line 29 the method detectChanges
  -- apps\conduit\src\app\app.component.ts
  ctrl + click line 25 the method take

I hope you can reproduce it with these steps. Let me know.

Voila. i don't know for now how i can debug it but if you can't work on it => I can try.
It's a problem in angular projects right now that use john papa extension package that include your extension https://johnpapa.net/essential-angular-vs-code-extensions/
(it's popular which impact a lot of devs/companies).

vscode: 1.27.2
vscode-ng-language-service: 0.1.10

[matheusdavidson]

it is indeed very slow, disabling language service fixes, would like to use it but intellisense is too slow

[NSExceptional]

Also slow on macOS on the latest version at the time of writing. C/C++.

[muehlburger]

It's also slow on MacOS on the latest version for writing Go.

[wbhob]

I still frequently experience this issue with 0.1.11. Are there any plans to dive into this deeper?

macOS 10.14.4
VS Code 1.33.1
NGLS 0.1.11

[gittar]

same here, makes intellisense mostly unusable. This is i.m.o. more relevant than many other features since it affects basically the whole userbase. Anyone fixing this would be my hero :-)

ubuntu 18.04 LTS
VS Code 1.33.1

[Yonben]

Same for me. IntelliSense is extremely slow, very very frustrating experience :/

macOS 10.14.4
VS Code 1.34.0

[wbhob]

@gittar @Yonben how big are your projects? My theory is that it may be a side effect of huge projects (ours has hundreds of components), but it would be interesting if it's happening to you on a smaller project

[Yonben]

@wbhob Gotta admit I made a mistake. I thought I was in the vscode repo. For me, it's not an angular project... Thanks though, sorry for the notifications :/

[gittar]

Just a couple of components, really small

Am 21.05.2019 um 09:02 schrieb Yonathan Benolol [e-mail]:

@wbhob Gotta admit I made a mistake. I thought I was in the vscode repo. For me, it's not an angular project... Thanks though, sorry for the notifications :/

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[wbhob]

Ok. My next thought is this is a memory/optimization issue. I typically experience this after openning a few windows and closing them I think; it's intermittent now. @chuckjaz – do you have any news or updates about this performance issue since you last commented?

[Yonben]

I know my issue wasn't with ng, but I updated to Insiders build and it
fixed my TS Intellisense issue. Worth a try.

On Tue, May 21, 2019, 7:54 PM Wilson Hobbs [e-mail] wrote:

Ok. My next thought is this is a memory/optimization issue. I typically
experience this after openning a few windows and closing them I think; it's
intermittent now. @chuckjaz https://github.com/chuckjaz – do you have
any news or updates about this performance issue since you last commented?

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