Here is my Opera version:
Opera One(version: 112.0.5197.30)
Opera is up to date
Update stream:Stable
System:Ubuntu 22.04.2 LTS (x86_64; ubuntu:GNOME)
Chromium version:126.0.6478.183
and here is my system:
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.2 LTS
Release: 22.04
Codename: jammy
ISometimes when I start Opera I see very high CPU usage. The problem resolved when I opened Opera's 'Task Manager' and reloaded the problematic tab.
Hope this helps other people having similar issues