It's FAST. So fast on my E71.
Read all about the backend stuff right here: http://my.opera.com/operamobile/blog/2010/07/15/testers-wanted-opera-mobile-10-1-beta-for-symbian-s60
The normal beta download link won't seem to let me download it yet on the E71, so you can either download from the link above or use the Opera Mobile alt. versions page: