It will seem that a lot of things are that way when you are only 11 years old. Wait a few years and things will speed up.
My computer is pretty old, but it loads quickly with DSL, even messages. I suspect you ought to clear your temp files and cookies, then run your anti-virus and Adware programs to clean out the hidden stuff. You may even want to defrag the memory. If that doesn't work, perhaps you don't have up-to-date "cleansing" software. If all that doesn't work, maybe it's your computer.
Ok normally the pages load quickly as I stated before. Every once in a while they lag but I think that has more to do with my computer. When posting however there is a pretty significant wait time involved. Sometimes it takes 5 min for a post to finish uploading. This is a pretty significant amount of time but it's not always 5 min it's usually within 30 sec.