Sonic & All-Stars Racing Transformed is now on the Vita3K compatibility list . This status indicates that the game can be played from start to finish with acceptable performance and no game-breaking glitches.
How to Set Up Sonic & All-Stars Racing Transformed on Vita3K
To get the game running in its "verified" state, follow these essential steps: Compatibility List - Vita3K - Playstation Vita Emulator