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I can confirm that enabling opera://flags/#sidebar-site-panel as leocg suggested on Apr 17 2021 does indeed work for now. Just enable the flag, restart Opera, enter sidebar setup and scroll down to "Custom site panels". Add either http://web.threema.ch or https://web.threema.ch
I just installed Opera GX on my Mac for the first time and I don't see the CPU Limiter either. I use Opera GX on Windows and it shows up there, but no CPU Limiter on the Mac version. Searched the settings and the internet for answer, but no such luck. Will this feature be added in the future or is there some kind of restriction from Apple that the Opera team has to obey?
LVL1 (core: 67.0.3575.130)
System:Mac OS X 10.15.4 64-bit