I did try 360Browser, which wasn’t good, so gave Opera a try. Looked good at first, quite fast, and no type lag, but there were other, more significant issues.
Typing into the text box won’t allow you to scroll down to access the modifiers for italic, bold, video, etc, which is irritating, but even worse, once you enter a thread, Opera won’t let you out, tapping the Chat button just takes you back into the thread you’re already in. To get out you have to go into Forums then select Chat.
Bloody pain. Sticking with Safari, the lag seems to go away after awhile, but all other functions work fine.
This on an iP4, btw.