Ok problems with laptop is now sorted. Still having some performance issues in modded minecraft. Vanilla minecraft runs like a dream, but as soon as forge is installed, the FPS is halved. I dont even have mods installed with forge.....
Here are some JVM arguments that i use in both versions. In vanilla, i get whatever fps is set and in forge, its mostly 60 fps, which is not bad, until i install mods. Then i get unstable 30 to 50 fps.
-XX:+UseG1GC -Xmx4G -Xms4G -Dsun.rmi.dgc.server.gcInterval=2147483646 -XX:+UnlockExperimentalVMOptions -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
I also have optifine installed in forge. Should i leave optifine and try fastcraft or better FPS?