Google's News app has this issue as well. This proves your theory so the Chrome browser engine causes the problem.

The problem still exists.

Still not good. I must use v47.3. In opera 47 is perfect and smooth. Please fix it.

@miyukiwork I usually use it when I want to read some articles but I need a clear browser for a while without any disturbing tab so I save the pages and visit them later.

@kmielczarczyk I also want to turn it off completely because it is annoying sometimes. It doesn't work properly.

I have a problem with scroll to top feature. I can scroll to the top perfectly fine but when I click again on the active tab it scrolls the page a slightly under than my previous position. It is a little bit annoying.

I only need 2 more features and opera would be perfect for me. These features are: tab groups and webpanel on the sidebar (like those that already exists, but i want to pin spotify and google keep too so it would be great if it works with any webpage)

It would be a really good feature if we can mark tabs with colour or simply the perviously visited tab would get a highlight colour. I always have a lot of opened tabs and when I click to another tab it would be great if the tab (which I clicked away) get a highlighted colour, or a dot (like in android unseen messages dot on the top of the icons) so I can switch it back fast.

My opera mobile version is 48.1.2331.132804
Scrolling was much smoother in the previous versions. Now it is strange. Have you noticed it too?

@emoller Thanks for the answer. My phone is Samsung (i9070) Galaxy S Advance. My phone have 768 MB Ram. How can I do (make) that the tabs in the background stay in memory.