@donq, I installed Fiddler with a root certificate. But the results are a bit unexpected:
The reason of CPU load that address-bar-dropdown-categories is ON by default. ))
(without prediction in address bar.)
It is not clear for me why this function consumes so many resources.
Fiddler don't shows any packets in the load. Generaly. Until I press "enter".
But... Firewall says about Fiddler, MS Defender and Opera packets. Hmm...
Sometimes - about MS telemetry, but not always.
Here is the screen.
When prediction is on, Fiddler shows the packets going to the Search site and Fiddler.
When Сategories is OFF, with prediction opera take no more than 25% of cpu for 3-5 seconds.
Everything turned out to be a little easier. Maybe..