TS Completion is slow when opening another large file

[octref]

Version: 1.34.20-insider
Commit: 57b550c559b945eb9d871dbf2b2e4cb9e31e2551
Date: 2019-05-10T17:35:18.558Z
Electron: 3.1.8
Chrome: 66.0.3359.181
Node.js: 10.2.0
V8: 6.6.346.32
OS: Darwin x64 18.5.0

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Try to trigger completion on this file:

const ts = require('typescript')

ts.|

If I only have this file open, completion will be fast.
If I have another large JS file open, completion will be slow.

Repro:

• mkdir test && cd test
• yarn add typescript
• Have the above code, do a completion. 🐇
• Open node_modules/typescript/lib/typescript.js, do a completion. 🐌

[mjbvz]

Does this repo on typescript@next too?

[octref]

@mjbvz Yes, repros for me on 3.5.0-dev.20190516.

[mjbvz]

Using typescript@next, I confirmed that the tsserver seems to be taking a very long time with a geterr request in this case. VS Code attempts to cancel the request but the server continues processing it. Here's a quick profile after triggering geterr: