Still there has problems. Opera Mini takes too much time to load any video for video streaming and if I do rewind that following video it takes another hell lot of time.
And while play/stream audio file, we can not rewind the playback forward or backward.
In Extreme mode, Sometimes facebook images doesn't loaded. If I do refresh the page then those image will loaded. Sometimes File downloading speed got super slow & if the download got interrupted then most of the times resume doesn't work.
And the full screen ads. When I'm in the middle of an important work then Suddenly a annoying full screen ad just comes up & makes me crazy.

No Way.
Opera Mini developers set this full screen ads like this. No option to opt out from this. But maybe there is a way. Disable the ad module using 'Lucky Patcher' app.

I enabled "Keyboard Suggestion" & "Hardware keyboard Suggestion" option from the settings menu of Windows 10 v1803. While Firefox & Chrome browser can show keyword suggestion Opera can't. Please, fix this ASAP

Nope, man. It's not fixed yet.
Check it again.
Check the full Wiki page of Opera Mini. And then you'll find out.
I've two devices. Samsung Galaxy J7 & Motorola G5 Plus. My friend has Xiaomi Redmi 4X. Facing this problem all of those devices. Both in Automatic & Extreme Mode.
So, check it again & fix this ASAP.

Huh, this will never be fixed.

I alredy filled bug report for this problem but developers seems careless. And I've to write it again. Please, fix this ASAP.
On some websites Opera Mini can't able to render font as well. Texts are overlapping each other & can't able to read only in Automatic / Extreme mode.
I browse Opera Mini's Wikipedia page https://en.wikipedia.org/wiki/Opera_Mini
& saw this problem :

Still Nothing At All.

As of now, Opera Mini 35.3
& Opera Mini beta 36.0 are the latest

Please fix this problem. It's not fixed yet.
This problem ruined me.