How do I get my facebook to stop lagging and glitching?

[So Sick Nick]

It started about 2 months ago. Everytime I upload a picture it will display sometimes and then sometimes my old picture will display. My wall posts and comments are the same way, sometimes they will show up and sometimes they won't. My chat freezes up or sends too many times at once and it's getting really annoying. Ive already tried changing passwords but it doesnt work. Its also not my computer because my brothers facebook on here works fine. Has anyone had this problem? What should I do??