If it is your computer have you tried clearing your cache, and cookies they are used to store information on your computer but after awhile they will slow you down too. Go into your history and delete everything.
If your computer is slow its not your fault, just delete your history in Internet options and try again if that still doesn't speed you up you might have viruses or corrupt data. There may even be unused files on your computer that could slow you down too. For the time being go into options on Zomg and reduce the graphics to low. It should help a little.