Deno•12mo ago

Super slow LSP with Deno + VSCode

We experience a really degraded DX in our IDE (VSCode) since we migrated to Deno 2.1.2.
We have a Deno workspace with some backend services and a React SPA built with Vite.

Slow start (lots of "Loading...")
Blinking stuff (colors change, underlines, inferred types...)
Slow (lots of "Loading...") when we open a file for the first time.
Slow when we type stuff (see video below).

AlmajuOP•1/15/25, 4:50 PM

Here is the dump of my LSP status (I removed the local files of our project in the "Documents in memory" part).

status.md452.71KB

AlmajuOP•1/15/25, 4:51 PM

Here is a live example comparing Deno vs TSC.

AlmajuOP•1/16/25, 2:01 PM

We had to roll back to using tsc in our IDE.
A simple reproduction scenario is to run and open the project in VSC, it's already pretty slow with it.

Kasper•1/28/25, 2:35 AM

I have also run into this. Cant find any information on how to solve this. Surprised this topic isnt talked about more.

CodyC•1/31/25, 12:44 AM

FWIW, there are reports of LSP performance fixes in the latest deno release (v2.1.8). See if that improves things for you?
https://www.reddit.com/r/Deno/comments/1idwroh/deno_218_is_out/

From the Deno community on Reddit: Deno 2.1.8 is out

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