I have discovered that either really high end or really low end PCs/Laptops experience an issue where Terreria seems to be going in slow motion. Want a fix? Here it is: Launch Terraria, go to Settings, and towards the bottom make sure that a setting says "Frame Skip On". This will fix your issue, did for me. I was going out of the house for a little while and was curious to see if Terraria would run on my Asus Eee 1005HA-B. It worked fine after I used the above fix. Keep in mind that my Netbook is NOT the main PC that I play Terraria on. I use dropbox to keep my files synched across machines I heart DropBox!