They added it in flags
opera://flags/#disable-pull-to-refresh-effect
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It's very annoying, it hangs on page loading, Android detects it as a program error while opera asked if you want to close tab.
I ended up using another broswer aswell.
Opera 25 was the last good one.
Cleaning cache will only help for a while,they need to add a feature where it could clear cache only to improve performance automatically,