Xcode plugins post

:+1: to the content, really good. I have some small grammar edits:

Btw - I don't prefer ambiguous terms like "stuff" (I changed it in my edits below)

> Doing computationally intensive tasks like reading many project files at once could really bring Xcode UX to his knees. So try to make use of `GCD` and `NSOperationQueues` when doing non-UI tasks. Don\'t try to parallelize too much without paying attention, since creating a lot of threads and killing them is not a cheap resource. In my case, I created a NSOperationQueue with controlled concurrency for each project you have in the workspace, that allows to do the indexing of classes/protocols in the background without interrupting the UI thread.