Untill now I've accepted this game is high quality & a Galaxy S3 just about copes. slight jumps and stuff but nothing major Spa & Le Mans ran ok, Endurance caused pause when loading/removing cars. I saw another reference to this RR3 GFX & wondered what it could do for me (many thanks to that person)
Now I've installed RR3 GFX selected low detail & tried it, Asterion Endurance Le Mans morning. smooth as you like & it loaded in half the time!!. Mirrors still don't work but can live without the distraction.
In short I needed & am glad I've got RR3 GFX now. give it a try, lots of settings, if you've got a new device you might be able to turn up the graphics.