the native BlackBerry browser is very slow, but that is primarily because of page rendering. Various other browsers (like Opera Mini) are much more capable of rendering pages more quickly.
The blackberry browser and Opera Mini suck and are horse sh*t. Bolt is by far the best browser you can go with on the storm. I've used it since day one, when it came out on beta. Its probably like 1000 times faster than the blackberry browser & Opera Mini. And the way its layed out is beautiful. If I were any of you I'd go with Bolt!!!