Created attachment 162689 [details]
javascript2-all-in-one-issues.zip

Hello, i'm using NetBeans for JS and Java devlopment. Thanks for new JS-related staff introduced in Release 8.2, but implementation has numerous performance issues - project is loaded for extremely long time and editing of files is laggy (while editing JS libraries of 10K lines).

I've self-profiled Netbeans and applied some hot fixies in my local dev-built. Most of the performance issues seem to be fixed - the rest does not look to be a show-stopper and do not look to be easily fixable by external person. Anyway - the build i have locally seems to be rather OK for me.

So ... 
- there are 20+ issues in attached zip each in separate file - the most severe typically go first. Each sub-folder includes screenshots from self profiler for the issue to be fixed. Also subfolder may or may not contain some description.

- zip also includes an all-one-patch - i was going to make individual patch per-issue, but this appears to be extremely time consuming for me

Note: it seems that enabled 'View -> Show Breadcrumbs' cause much more frequent reparsing of sources and self-profilier better shows hotspots in this case.


Patch relies on LruCache file, the new one i've added into 'openide.util\src\org\openide\util' - it is provided as separate file and already included in the patch referenced in another issue (https://netbeans.org/bugzilla/show_bug.cgi?id=268744 - i'm not sure if it will be aplied).

Attachment also includes test project with few 'real' files which provide enough load to easily reproduce issues.