The PS3 simply can't handle it, and as harsh as it sounds, you should get yourself a PS4 soon anyway because they're going to discontinue the PS3 sooner or later.

The PS4 isn't new anymore, I sympathised with PS3 users at first, I was one of them for a while. But getting yourself a PS4 is going to enhance your gameplay so much and also save yourself from having to buy one further down the line.