I'm finding the same thing on all my computers and all my computers are fast!
I notice that when I first launch Opera, it takes several seconds for the Speed Dial page to populate.
It takes so long that it's quicker for me to just click a bookmark.
But Here's The Other Thing ...
Opera is now using crazy amounts of memory!
When I do a fresh launch of Opera, without even going to any site at all, it's taking up almost 400 Meg of memory!
And like right now, I have only YT on one tab and This Page on the other tab.
There's now 17 instances of opera in Processes!
Each sucking up memory for a total of approx.
805,048 Mega Bytes!
That's Almost 1 GIG for 2 tabs!!!!
17 processes of Opera for 2 tabs open is crazy.
I hope that the Devs look into memory management and efficiency, because this is now out of control.
As for Extensions, I only have a few that are needed.