Performance meta issue

[octref]

This issue tracks ground work and implementation of performance related issues.

Groundwork

• Add a setting for profiling VLS (vetur.dev.vlsPort) Add to FAQ how to profile Vetur #1180
• Add instruction for filing perf issues Add to FAQ how to profile Vetur #1180

Improvements

• Send Cancellation Token to TypeScript Language Server Send Cancellation Token to TypeScript Language Server #1263
• Improve performance of getSingleLanguageDocument and getSingleTypeDocument Improve performance of getSingleLanguageDocument and getSingleTypeDocument #1264
• Support incremental document updates Support incremental document updates #1141
• Excessive file system IO Excessive file system IO #1277
• Cache module resolution as well Cache module resolution as well #1286

Need Investigation

• When project has jsconfig.json with path alias, ".vue" intellisense is slow When project has jsconfig.json with path alias, ".vue" intellisense is slow #1307
• Language server will idle or slow when open more 6 files in workspace Language server will idle or slow when open more 6 files in workspace #1317