Too slow Language Source Term Tab in inspector

Hi,
Thanks for reporting that issue!
The customs inspector was not designed to show that many terms as must games don't get near that.

Nonetheless, I just changed how the terms are displayed and managed so that no matter how many terms you have it will be smooth and fast.
I added the new changes to the 2.3 version I'm going to release in the next few days.

While I finish testing the rest of the 2.3 changes, you could split all the terms into several Language Sources. So that each of them only store a thousand or so.
If you add several language sources to your initial scene, the Localization Manager, will combine them all and you will be able to access the complete localization in the game.

Again, sorry for the inconvinience and thanks for reporting that issue!!
Frank