I think know how many data received are same important as how many data saved.

I can understand designer remove it from O menu to make it simple, but why not keep it in detail page?

See this post:
http://www.opera.com/blogs/desktop/2016/03/quick-opera-stable-35-0-2066-92-update/

DNA-49372, Freeze on Windows 10, and it should fixed in this version.

Still have this issue on OPR Dev 37 (latest), This comment is copy from notepad , and paste to here, because keyboard not work.

Same problem, but it disappear after disable hardware accelerator.

Hello,

http://aiyou.im/archives/opera-geng-huan-baidu-sou-suo.html

See this post to change your default location of opera.
I'm sorry for this article only have Chinese version , you can try use Google Translate to read it.

Same problem on my work PC , but no problem on my own laptop.
With same version of Opera , same version of Windows 10 , All software up to date.

No plugin installed , no extension installed, even try after delete profile , but no help.
It seem like main thread freeze , it's a dead loop.

freeze > force close > restart > open last session tabs > freze > force close > repeat > tabs LOST.

Chrome no such problem(tested 46-48).

UPDATE:
Try to disable hardware acceleration.