I am currently in a bit of a transition process, migrating from Windows 7 to ... Windows 7, but freshly installed on an SSD. Time for boot and software loading has definitely gone down but as I am still running the same other hardware, performance not limited by disk I/O should be about the same.

Despite the recent update to 12.18 I have also pretty much retired my old and loved Opera 12 in favour of Vivaldi, which has matured to a practically usable state. Bookmark handling is or at least feels still inferior, but it's good enough.