• turn off all extensions
• reset flags to default

After 3 hr, my computer and Opera are both back to normal, running smoothly. The Disk usage has been less than 5% except a couple of times when it should have gone up (loading big pg, etc). It immediately went back down.

There are some other trouble-shooting recommendations on report probs page, so even if your situation is different, it's worth checking into. I think resetting flags fixed mine. Am going to re-activate my only extension & see what happens.

Thanks leocg!!!

Just want to add that I have the same problem. When it happens, Task Manager shows that the Disk use percentage is in the high 90's to 100%. The high percentage flips between Opera & System. The content of the pages makes no difference. The %Disk usage goes down after I shut down Opera, but recurs on restarting the program. Have to reboot for it to be functional again. Doesn't happen with other progs.

Going to problems link now.

-- EDIT --
On Report Problems pg, it says to try disabling extensions & flags. Am trying & will report back after running for a few hours... :p