Sourcekit LSP completion delay with sublime text

[blangmuir (Ben Langmuir)]

@blangmuir

Okay thanks! Looking at your log, there are about 32,600 global results. This is a known performance problem in SourceKit-LSP caused by serialization performance to JSON. Our plan to tackle this is to implement server-side filtering for completions so that we do not have to serialize all of the results.

Now fixed in master branch: Code-completion performance improvement via server-side filtering