Typing '.' works quite fast for me (always <.5 seconds) and I'm running in a VM with a debug build of SlickEdit. However, typing '(' takes 3 seconds . With a release build on a faster machine, it takes 1-2 seconds to type '('. Not great. If you don't have a SSD, I would expect these times to be much slower than what I'm seeing.
Turn off Java>Context Tagging> "Auto-list compatible parameters" to make it faster.
Turn off Java>Context Tagging> "Show comments" to make it faster.
I think fetching the comments is slow in this case due to the fact that the comment is in "src.zip" which is huge. You can always type "Alt+Comma" when you want to see the comment.
If you turn off Java>Context Tagging> "Auto display parameter information", you won't be waiting for anything. However, it's a sledge hammer approach.
I'm surprised that just displaying the parameter argument information takes so long since listing the members is quite fast.