I am running the 3.14 drivers on my pinball cabinet. It has an E6500 dual core, 2gb of ram, GTX560ti 1gb, running on XP 32-bit. The graphics card is a new addition after the 8800GTX that was previously in it died. The upgrade has meant I can finally set texture sizes to unlimited rather than 1024. Using 9.14 I can run the 120 tables I have installed with no stutter. That includes tables that many people seem to have issue with: monopoly, lethal weapon, indy 500 gi8, etc. My playfield is 1920x1080, blackglass/DMD 1280x1024. I have played around with FXAA and AA with no noticeable hit to performance but I have decided to leave FXAA off as I don't like the subtle softening to textures it introduces.
Because I wanted to play JP's new Star Wars table I started using vPinball rev476 and the majority of tables still play flawlessly. However I did notice some instances where the ball would leave behind an image of itself. Usually in the trough or near the top of the playfield - on the ramp in Elvira and the Party Monsters for example where the ball leaves the screen.
The main issue I had though was that about 5 tables would slow the system down to a crawl when they started. This could only be fixed by resetting vPinmame and then everything would be fine again. I was told on these forums that the problem was caused by the fact I was using the 3.14 nvidia drivers, but this doesn't happen on ANY table using v9.14. For now I am just making Hyper-Pin use the rev476 exe to load the Star Wars table and 9.14 for everything else. I initally had it the other way - just using v9.14 to load the tables that cause the slowdown, but I thought better to wait until 9.15 is finalised.
Off the top of my head some tables that caused the slowdown were: Congo, Lord of the Rings, Indy 500 GI8, and Stargate.
I'm perfectly happy running 9.14 and I realise that 9.15 is still being worked on but I thought this information might help/interest the developers. I'm happy to try out any other revisions if it may help isolate a bug.
Cheers