I’ve recently read about an excellent tool called CloudFlare that can really help speed up your website, as well as keep on top of security threats (always a good thing!).
CloudFlare is most likely easily implemented through your hosting company (if you’re using one of the big popular ones) and you really don’t have to do a lot to get it set up, it just starts chugging away. There is a free version, always appreciated, so you can try it out for a while before deciding whether you might want/need some of the extra features offered through the paid plans.
All in all it sounds pretty slick, and I really loved the intro video on their home page!