Managed to solve it. After every firmware update you have to do the following. Which most people won't understand.
Clear Opera App cache
Reboot into official Samsung recovery and wipe cache.
Most people including me will give up before especially wiping cache from official Samsung recovery.
But I did wipe it. And everything is smooth for now. Opera seems to be the first app that will stutter but you'll have to clear Opera cache and wipe cache partition. At Samsung devices.
Remember not all people are understanding to go into recovery mode and wipe cache partition. It worked fine but I consider it luck.
Did you update Android webview?
Did you update Opera?
Did you update play services?
If so first reboot and if it doesn't work wipe cache which most people won't understand.
At xda you can find how to wipe cache for a device and that is very difficult for average user.
For now opera is smooth again until webview and firmware updates and so on and on and on.