Me too am experiencing FPS drops since 1.07 hit the servers.
I have a desktop pc with an Nvidia gtx 460 as video card.
All drivers are up to date (video card, mainboard, audio etc).
I got them mostly in act 3, drops from 59 FPS to 10 FPS.
Sewers have some problem since way before 1.07, at some crossing FPS drops from 59 to 30 with no apparent reason.
Unfortunately I cannot advice you about solving this problem, I'm still trying to find some clue.
My laptop used to run stable on 30~ FPS (25~ when in the aqueducts) now when combat happens my FPS drops to around 10~.
The last time I played was a day before 1.07 and I didn't experience any of this.
I have a desktop pc with an Nvidia gtx 460 as video card.
All drivers are up to date (video card, mainboard, audio etc).
I got them mostly in act 3, drops from 59 FPS to 10 FPS.
Sewers have some problem since way before 1.07, at some crossing FPS drops from 59 to 30 with no apparent reason.
Unfortunately I cannot advice you about solving this problem, I'm still trying to find some clue.