NZL-Banana

I have had issues previously playing any mod packs using the Technic launcher or vanilla launcher when not in full-screen, my computer is hugely overkill for playing Minecraft even with the amount of mods added by some of the Technic mod packs, if i turn v-sync off i get around 300-fps and massive screen tearing. F11 to swap to full-screen, or in the graphical options. Hope that helps!