I'm finding 25.0.1614.50 MUCH slower to open. The start page takes at least 11 seconds to display (I am using the old start page, which I prefer over the new version), but open times are no different with either version.
Page loading is about the same as the previous stable version to me, and I've not experienced a page crash regardless of the content.
I sure hope they get this sussed. It seems Opera is becoming more and more like the other browsers these days and each update seems to be a bit less "Opera-like" than the last. I'm seriously thinking of finally abandoning the browser I've used for over a decade.