Nope. Sorry. If you are jailbroken, add this repo to Cydia: cydia.pushfix.info/
Then go to that repo and install TCP optimizer. It is suppose to increase the buffer speed for loading YouTube videos.
It may or may not work. I have no idea if it has been updated for iOS 5 (If you even are on iOS 5. If not then I know for a fact it works on iOS 4)