dart_frog VSCode extension slows down VSCode significantly

[lukasnevosad]

Type: Bug

When the extension is enabled, VSCode is significantly slower, even in code that has nothing to do with Dart (TS, Next.js). It especially shows when e.g. clicking a symbol to see its definition definition or it shows "Running 'File Create' participants..." for many seconds when a simple new empty file is created.

Extension version: 0.2.3 VS Code version: Code 1.92.2 (Universal) (fee1edb8d6d72a0ddff41e5f71a671c23ed924b9, 2024-08-14T17:29:30.058Z) OS version: Darwin arm64 23.5.0 Modes:

System Info

|Item|Value| |---|---| |CPUs|Apple M1 (8 x 2400)| |GPU Status|2d_canvas: enabled
canvas_oop_rasterization: enabled_on
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_graphite: disabled_off
video_decode: enabled
video_encode: enabled
webgl: enabled
webgl2: enabled
webgpu: enabled
webnn: disabled_off| |Load (avg)|5, 4, 5| |Memory (System)|16.00GB (1.26GB free)| |Process Argv|--crash-reporter-id 311a7b37-1935-43ef-9642-1aa3900866b8| |Screen Reader|no| |VM|0%|

A/B Experiments

``` vsliv368:30146709 vspor879:30202332 vspor708:30202333 vspor363:30204092 vswsl492cf:30256860 vscod805:30301674 binariesv615:30325510 vsaa593:30376534 py29gd2263:31024239 c4g48928:30535728 azure-dev_surveyone:30548225 2i9eh265:30646982 962ge761:30959799 pythongtdpath:30769146 welcomedialog:30910333 pythonnoceb:30805159 asynctok:30898717 pythonregdiag2:30936856 pythonmypyd1:30879173 h48ei257:31000450 pythontbext0:30879054 accentitlementsc:30995553 dsvsc016:30899300 dsvsc017:30899301 dsvsc018:30899302 cppperfnew:31000557 dsvsc020:30976470 pythonait:31006305 dsvsc021:30996838 9c06g630:31013171 pythoncenvpt:31062603 a69g1124:31058053 dvdeprecation:31068756 dwnewjupytercf:31046870 impr_priority:31102340 nativerepl1:31104043 refactort:31108082 pythonrstrctxt:31112756 flightc:31119335 wkspc-onlycs-t:31111718 wkspc-ranged-t:31118572 ```

[alestiago]

I think I'v experience similar behaviours but I haven't invested the time into benchmarking it. I have a gut feeling that there is a resource that is leaking, might be regarding the daemon or probably during initialization.

@lukasnevosad have you benchmarked or inspected the extension to see what function is using resources that might slow down VSCode?

[lukasnevosad]

I am afraid I have no idea how to debug this. This report came from "Extensions Bisect" feature of VSCode, which pinpointed this extension. I could clearly see immediate results turning the extension on/off. It then even created this GitHub issue on by behalf.

The slow down occurred multiple times before and has not occurred again since I turned this extension off.

The project I've been working on with dart_frog (which is otherwise awesome, btw.) is on hold at the moment, but I will certainly need to switch the extension on again when I return to it, so I will try to do some more debugging then.