Performance problems with new groups search/filter and large databases

[AEgit]

JabRef 4.0.0-dev--snapshot--2017-05-18--master--018173ebd
Windows 10 10.0 amd64
Java 1.8.0_131

The newly implemented groups filter/search (#2588) exhibits massive performance problems when used on a large database (>10,000 entries, ~1,000 static groups).

1. Open large database
2. Start to enter any term you want to search for in the "Filter Groups" part of the groups panel.
3. You will immediately see a massive performance decrease. It takes minutes to just complete entering the word you want to search for (because the filtering starts immediately). The groups filtering itself also takes minutes to complete. During that time JabRef behaves as if it had crashed.

This issue has been reported before (#2588 (comment), #2588 (comment)) but I have been advised to open a new ticket so that the issue is not forgotten.

[tobiasdiez]

This should be fixed in the latest development version. For a very large groups tree, the filtering process still takes a moment and is not as fluid as I would like but at least it works now. Could you please check the build from http://builds.jabref.org/master/. Thanks!

[AEgit]

JabRef 4.0.0-dev--snapshot--2017-05-20--master--01e854829
Windows 10 10.0 amd64
Java 1.8.0_131

I can confirm, that the performance has drastically improved. A group search takes no longer a couple of minutes. However, as you say, the performance is still not very high for large databases. In my case it takes 14 sec after entering a search/filter term for the group to be displayed. If you are switching often from groups to groups, I think this is a bit too much.
As a workaround: Would it be possible to not start immediately filtering/searching for groups while entering the search term? I. e., could you make the groups search/filter so that you have to press "Enter" to actually start the filtering/searching. This might already improve the subjective performance (?).
I would suggest to keep this issue open.

Thank you so much for your work!