When cloning a pinned tab, please unpin the cloned tab. (Obviously it makes no (or not much) sense to have several cloned and pinned tabs of the same URI).
Thanks for considering.
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I've seen the leak three or four times more yesterday, while in Opera Beta or Dev. Apparently not related to the content of the page, but I might be wrong here. Before that I thought it had to do with Discourse, but it happened also on other pages, even with only "opera:sync-internals" open.
But it is definitely not related to Gmail.
Anyway, I don't care much anymore. In the meantime Opera exposed so many other technical problems and design problems that I moved on to Vivaldi. This thing is felt 50× better than Opera and might be a worthy candidate for my future default browser. (Well, currently it already is my default browser, but still on a trial level.)
Nevertheless many thanks for your replies and support efforts, @leocg
@leocg, thanks for your reply. Any link to that release post?
In case you mean this:
[Mac] Memory leak from gmail
Please report if you encounter any memory consumption issues using Gmail. We are currently investigating the issue.
I don't use Gmail.
The new Beta (62.0.3331.5) seems to have a serious runaway memory (or leak) problem:
Could reproduce this several times by just surfing this forum in a single tab for a couple of minutes, and no extensions except the default ad-blocker.
The release version (60.0.3255.141) runs fine.