There only few minor bugs, that need to be fixed and good thing about them is, they aren’t engine related mostly. However, should you still face issues we have this Sonic Generations Crashes and Fixes guide to help. Solid 60 FPS cap, visually brilliant and smooth gameplay make all the difference and Sonic Generations have them all.
Sonic Generations is by the far the most optimized console port released on PC in my recent memory.