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Sorry for the late reply.
I uninstalled the new version and installed the old version.
Old versions are available here.
https://get.opera.com/ftp/pub/opera/desktop/
To stop automatic updates, disable "Opera scheduled Autoupdate".
Control panel > management tool > task scheduler
I have the same problem.
Even if I just open 3-4 tabs, the operation is very slow and may crash.
Reinstalling several times did not help.
Reverting to 77.0.4054.277 solved the problem.
Disabling the automatic update schedule is mandatory.