Well, tested the new release since yesterday, I always considered it to be 'Snappy' to quote gadget1974 above. The good news is that now it stays snappy with more apps open and it doesn't require anymore reboots to get rid of memory clutter of the browser.

Misc stuff that seems to have improved,

-establishing a WLAN connection seems to happen even quicker
-nav pad can now be used to browse to pdf pages

Probably loads more subtle changes...