Performance issues with folding

Using VSCode 1.63.3, MATLAB 2021b on macOS 12.1 I am having many performance problems. I have disabled all my extensions except this one. I have lintOnSave set to false, and have tried providing or commenting out the mlint path. Every time I save the Process Explorer shows extension host go up to 100% CPU and saving takes a couple of seconds for a MATLAB classdef ~1500 lines log. It is as if lint on save is still activated? General performance slows down too with extension host often hitting 100%. Disabling the extension and everything goes back to normal… Is there a way to fully disable linting?

[ghost]

The latest version of the service has significant folding perf improvements, you can test that in the terminal if you have NPM.

$ cd ~/.vscode/extensions/gimly81.matlab
$ npm install vscode-textmate-languageservice@^latest

Hugefiles are still anemically slow but they don’t block the UI thread completely.

[ghost]

Okay so I’ve figured out the problem. 😳🙈

https://github.com/SNDST00M/vscode-textmate-languageservice/blob/v0.2.1/src/foldingProvider.ts#L97-L107

This is a loop algorithm that determines the line of the terminating token in the foldable. However, it does not terminate when the fold is completed and continues to loop until EOF token.

If there are 20 folds that’s >20 loops til EOF with potentially thousands of superfluous tokens. Etc.

I was focused on researching browser support but I’ll pause that and putt out an urgent fix for this ASAP