I use Dolphin Mini (not HD version) for my Android phones and tablets. I find it fast and bug-free. The Mini version is supposed to be designed for less powerful smartphones (eg. those using processers earlier than the Cortex A8), but I actually prefer this to the full HD version, because it seems less buggy and not as much a RAM hogger. The speed of Dolphin is as good as the default Android browser and faster than Opera. One big plus with Dolphin is that the menu to wipe browser history, cookies, PWs etc. is easily accessible when you close the browser.