ThunderBird 115 slow and unresponsive

Hello.

In the latest day I upgraded ThunderBird and got 115.3.0.
Well, it's *SO* *MUCH* slower and less unresponsive than 102, it makes 
me think something is wrong.

E.g.
Dragging the separator between message list and message preview was real 
time on 102; on 115 you drag it, release the mouse button, and after a 
second the panes resize.

Selecting a bunch of messages and moving them to a different folder used 
to be close to immediate on 102. On 115 the window is repainted a couple 
of times after each message is moved. So to move, let's say, 20 
messages, 10-15 seconds are needed.




I've not used 115 much on other platforms, but as far as I can remember, 
I didn't notice such an unresponsiveness.

So is there something wrong in the FreeBSD port? Something to tweak?
Was there some infrastructural change in the UI?
Is anyone else experiencing this?

  bye & Thanks
	av.

P.S.
I build TB myself with poudriere.