Localization Picker is extremely slow

Opening the localization string picker and typing within that window is incredibly slow.
We have a some pretty big string tables in our game and the editor crawls to a halt whenever typing some text.

I opened the profiler with deep profiling enabled and found a huge amount of collections being enumerated and lists being created leading to large allocation

Is this something the localization team are aware of?
The experience of using the picker is really bad.

Disabling the picker here:
localizationPrefs

Leads to much better performance, almost no lag.

Hi,
Could you please file a bug report so we can look into it?