I've yet to test everything (running game in lower res and other driver/setup related sheaningans), but the game runs considerably worse than A16.4 after the upgrade. I expect around 40-60% performance drop at least, which is tremendous.
specs:
i7 8700k (stock clocks)
16GB RAM
GTX 1050ti
SSD/SSHD setup
1920x1080
Back in A16.4 (graphic bugs aside, so SSAO was off), I never dropped below 60fps running the game completely maxed out. Right now, it seems the basic settings don't really impact performance at all - in fact - increasing certain features makes the framerate slightly higher and more stable, than running it on low. CPU is basically sleeping (around 12-15% usage), GPU on the other hand is running at 91-100% (Unity clearly squeezes everything from it on DX11, which might indicate issues). Framerates range from 50-45fps in desert biomes, 42-35fps in forest biomes with cities nearby to around 32-35fps in towns. Things seems playable, until you enter any of the structures; regardless of zombies or not, framerate almost always plummets to around 25fps and can fall as low as 20, when there's a lot of zeds around and the pois are huge. I even swapped from previously used 391.35 drivers to the latest version, no difference what-so-ever.
TL&DR A17 Exp runs like ♥♥♥♥ no matter the hardware setup you have. I hope things will get better, as the new version definitely holds a lot of promise; gameplay-wise, this is the best update 7dtd got so far.