There's no way your CPU can't handle PokeMMO. Update your java(be sure to remove cleanly old java versions), use the 64 bit java. Reinstall pokemmo and follow this guide https://www.reddit.com/r/techsupport/comments/33evdi/suggested_reading_official_malware_removal_guide/
I have an AMD dual core CPU with very very bad IPC, and my PC is way weaker than yours so disscard a hardware issue because I run the game like heaven.