I have the same problem
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Tell us what's the problem. If not how to reproduce and tell it's a bug [...]
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[...] Windows 10 have a massive RAM leak [...]
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I've been using opera since 2004 and all these years was by far the best browser for me and have recommended it and installed to many of my friends. Unfortunately the transition to chrome engine has destroyed lot's of useful features I've been using all that time and I've lost the feeling that is now more useful and initiative to any other browser. Although I'm using opera 20 waiting since opera 15 all the useful features of opera 12.16 to come back it seems to me that it's not gonna happen. I'll stick with opera maybe for couple more versions and if I won't see those feature come back probably I'll move to Firefox.
The things I miss most are:
Bookmarks of course. I was using always the sidebar with the bookmarks and was the most useful way. And no the bookmark bar is not even close to the sidebar usefulness.
Change the search engine to whatever I want to, It's my browser I want to use as default my search engine.
Open some files directly in browser or with the suitable program. No I don't want to save it first I want to see if I want to save it.
Opera link as it used to work, but definitely after the proper fix of the bookmarks so as not to mix things around.
and 5. Something which I'm afraid I won't find it again, is going back to to the memory usage of old good opera. That was the first reason that I started to use opera and I loved that was a very fast and the same time was using the minimum resources comparing to the other browsers. Now it is using huge amounts of memory and makes my 4 gigabyte computer needing to use a lot of page file often. Now I have 7 tabs open of mostly static content with blocked advertises with adblock+ and it's using almost 750mb, what for? With 15 tabs with more content easily can use in excess of 2 gigabytes.
I haven't written this post in order to make any stupid flame war. I've written it only in a hope that opera developers will start to integrate again the features that I'm, and probably others, are missing. If not at the end opera is a company and I'm a user, I'll have to search elsewhere.