FX2 and FX3 used to run really well. Now I am having problems. Although the FPS overlay displays no less than 150 FPS, the performance does not feel smooth. It's good on most tables but on all of them there is slight microstuttering every now and then (every 30-60 seconds). On other tables the ball does not move smoothly at all, most notably on the Williams tables (Medieval Madness, Junkcard and others). The sound on Medieval Madness is noisy too...like an old 8 bit 22 khz recording or something like that.

On the Skyrim table I even had a situation where the ball stood still for 1 second at one point.

Is it related to Vsync?

My settings: Vsync on, AA 8x, shadows high, reflections off (I thought this would improve performance).

Intel Core i5-2500K PC1155 6MB Cache 4x3,3GHz boxed
MSI Radeon RX 570 Armor OC 8GB
be quiet! STRAIGHT POWER BQT E8-450W
ASUS P8P67-M Mainboard
16 GB Ram
Win7 64 bit
2x 500 GB SSD
2x 1 TB HDD

I don't have such problems in other games.
It isn't a big deal on most tables but still the performance is not as good as it used to be!