Phone [Q] gaming problem

hello everyone ,,,
i've bought the lenovo a3000h tablet recently,, and it works great but i'am facing a little problem with hd games
like real racing 3 or gt racing 2 ,, simply it's just heavy especially when there is competitors with you in the race it gets so baaaaad
but on the other hand modern compat 4 works great and many other games
note:: there's about 550mb of free ram and i close any other application before starting a game
so can any body help me ??!!!