Runescape 3 java FPS worse

I don’t play a lot anymore (mainly just POP), but before RS 3 Gold my Java client would be able to run max settings with no lag. Usually only dipping below 20 FPS in crowded areas.

With RS3, I’m almost never above 30 FPS. As I understood it, the Java client would not experience any performance issues with RS3, yet here I am, fighting performance issues.

I’m running on a laptop with i5-540m, Radeon 5650 1GB, 4GB RAM and an SSD. Like I said before, performance was never an issue before, but now I can barely play without lag.

Is anyone else experiencing FPS issues?