katiemaybe

Whenever I play Hexxit, it usually stays on the Mojang screen for 5 minutes before loading the main menu, when I begin playing it lags a little which is understandable since the world is loading and then it will run smoothly but after about maybe 30 minutes it will start lagging and the lag will get worse and worse till the point that I'll turn and it will take 2 minutes for the screen to actually respond and turn. I have graphics on fast, particles to decreased, smooth lighting off etc. etc. Could it be because I am using a texture pack? Please help any replies would be greatly appreciated