Latest Beta finally fixed the superlaggy Track Editor when deleting/editing points. It's orders of magnitudes faster now, minutes of waiting time turned to split seconds, no matter how huge the database.
Also, laggy list scrolling in track lists with plenty images in their description tags is fixed. Mini maps in track list still don't seem to be updated and mostly stay empty though. Shouldn't that happen automatically? What map data is used for that anyway, something online maybe?
Zooming in general with plenty points and lots of enabled tracks (tenthousands of trackpoints) seems way faster too. Zooming other regions of the map (where the enabled tracks aren't visible), is orders of magnitude quicker, as if no tracks were enabled at all. Impressive.
In fact, Locus feels so snappy now that I might consider trying to enable all my tracks of all my trips at the same time. This idea would make current Pro from Playstore cry for mercy and pretty much die in notime. Maybe this beta could handle it...

Good job with the performance... really! I'm impressed.