vscode: Intellisense Extremely Slow

• VSCode Version: 1.25.0-insider
• OS Version: Windows 10 1709

Steps to Reproduce:

1. Type Character
2. CTRL-SPACE to auto-complete
3. Go Eat lunch
4. Continue work

Does this issue occur when all extensions are disabled?: Yes

I have seen many other issues here opened about this problem but they all seem to get closed in some way or another. I cannot be the only one experiencing the broken-ness of Intellisense.

I am working in a JavaScript project that is not small on a very strong machine. When I first launch VSC if I let the editor rest a bit (perhaps index reading, not sure) then Intellisense works very well. After a bit of work in the editor (sometimes immediately but often a few minutes of bliss) the dreaded loading... indicator is all I get. I can wait from anywhere between 30s and 90s and the window does eventually appear. It’s worth saying this is not progressive – meaning once it goes south it never takes less than 30s.

During this time there are not other large processes running to spike the CPU. This seems to really be within VSC itself.

It is also worth noting that there are times when if I let it complete it’s loading cycle it starts working at normal speed again for a bit. This usually does not last long (2m) but it does happen.

I am willing to get the “intelli” part disabled if at least macros and auto-complete for local values worked. Any way to limit what it was trying to look through to present the feature.