I have a fairly recent Playbook. Came with 1032 and updated to 1088. I have so far only used the native browser. I find that it is quite slow to load many sites and often it will stall when site is say 60-80% loaded and if I just leave it for a while, it never does load. But if I try again sometimes after a few tries it will get to 100%. Not really acceptable. I have tried turning off flash and Javascript and that sometimes allows for faster loading. But then many sites need these, so they don't load at all.
I am surprised that some say they have no problems. Perhaps it just has to do with complexity of some sites and the number of ads that they load that each look for cookies?
If there is a fix, I would love to know what it is!