Why does Chaosville (minecraft modpack) run so badly?

This and a few other minecraft modpacks i've been playing (Moonquest, tekkit classic) have been running really slow for some reason. I've turned all settings down to their very minimum … Show more

Did you give the launchers more RAM to use? It comes with 1GB automatically (At least for technic and FTB) which isn't enough, try doing 3-4GB since you have eight. If you really wanted you can take the mods from the modpack folder, download forge for what version the mods are, and put the mods in the mod folder and play minecraft normally, it takes some time but will increase your FPS a lot.