It is interesting that this table ran great when I was using a static backglass. Now that I added the DB2S, it had trouble loading and when it did, I had some stutter. That is the first time that has ever happened with DB2S or B2S for me. I resized some plastics, as was suggested, and now it seems to be OK, although the FPS's are only around 70. I am wondering if I didn't size them correctly re the power of 2. I am guessing that the DB2S is also large, as it appears high-resolution (looks nice!). My card has 2 gb video ram so I am thinking it could be the power of 2 issue.
EDIT... I had been running it on vp915 because it wouldn't load on vp916. Just tried it again on 916 after the re-size of the plastics and it runs great! I am getting 270 FPS, up from 70 on vp915!
Hm... interesting. I'm running the latest 9.16 build and average framerate is about 350. After replacing the UVP with dB2S, I thought all stuttering problems are resolved but then I noticed that when flashers are very active, there is still some stutter (whereas with UVP the ball stuttered constantly, so dB2S was a definite improvement).
So I ended up modifying the dB2S, got rid of the flasher snippets and replaced them with regular lamps (because they are easy to re-size). I also decreased the number of light frames tied to one solenoid, for the most part there is 1 light per solenoid now, only a couple of solenoids are still driving two lights. I also tweaked the performance of the backglass, skipping something like 20 solenoid frames, it still looks pretty active and the stutter is almost completely gone but not perfect. In some scenarios (like when I make the bridge shot and the ball is rolling towards the right flipper) I can still see some very slight stutter.
I suppose the way this table was built is very demanding and as you said, the backglass is also large with a lot of flashers, so that has its toll on performance.
I didn't have such issue with any other table / dB2S combination before, no stutter to speak of so this is the first. Oh well, it is a lot better now 
Edited by htamas, 10 August 2013 - 04:38 AM.