I'm not talking about database queries, I'm talking about working within the UI. If you compare it to Navicat or any of the Java-based apps, TablePlus is really quite fast.

I've just compared TablePlus to PGAdmin (the new web one), on a fast query which returns 1000 rows. The responsiveness of TP is really noticable

I disagree.

Toad for example is really slow, but a lot of that is the design of the software itself (e.g. autocompleting the same thing twice is still slow the second time, because they don't do basic cache or predictive lookups).