I am not complaining about gameplay, just posting general issues, which reappeared with 2.5.

1) Huge frame drops. Most noticeable when there are lots of players on the screen, one can be wielding strength. Very similar to bug div fixed in post 2.4.2 (dynamic lightning with strength/shield taken).

2) Buffered input. Old problem came back. Sometimes you can't control yourself, because old input is executed. Happened after minimizing/restoring window.

3) Players are noticeably slower (like they are moving in glue), but also surprisingly became much harder to hit. For me, they are not flying into predefined directory any more, but looks like their warping in small steps. Might be caused by my addiction to 2.4.2 physics, so might be a problem from my own perspective only.

4) Mouse issues were already posted in other threads.

Sorry, wrong section. Please move to Support/Bugs.

disable lightmaps to regain 2.4.2 speed

I think they're disabled when selecting lowest quality.

Please state you hardware specs and OS. Or else it will be hard for anyone to help.

Radeon 9600, pentium 2.4, xp.
GeforceFX 5700, pentium 2.8, linux.
Integrated Intel (i915 chipset based), intel dual core (dunno remember freq), botx xp and linux. This one wasn't tested with 2.4.2 so can't complain, but this is unplayable.
Integrated Intel (945GM), atom, linux. Haven't tested yet.

BTW, new models have their own advantages: rocket missiles finally are clearly seen.

Ok, because nobody knows why fps dropped down so much, I'll try http://forums.alientrap.local/viewtopic.php?p=54462#54462 and replace new weapons with old ones. Maybe it's really weapon issue.