Last time i tested vivaldi i felt it much slower than opera, that’s why i still use the last one (since windows xp).
That’s what I thought at first, until I read this article. It turns out that Vivaldi can be just as fast as Chromium (or even faster) if you just disable some of it’s more intensive settings. I followed much of the advice listed there, but obviously not nearly all of it!
I add here some extensions too, like ublobk origin and popup blocker which impoves a lot the browsing speed and security.
I used the same ones too!