In the last version(s) of Opera it began opening all my Opera windows when I start Opera from my taskbar (after I started my computer). I use Win 10. My Opera has auto update in settings, so I don't know exactly the version opera started doing this.
Previously opera started just the last "active" windows I was using (open on my screen) when I shutdown my computer.
To save energy and for other reasons I shutdown my computer when I don't use it (up to many times a day). I work in 30-50 Opera windows with several hundreds of tabs. Please don't start argue the way I use Opera or my computer!!
Previously my computer and Opera started quickly, but the way Opera works now it's very time consuming and so memory consuming that my computer become slow and useless, when Opera open All my windows and refresh hundreds of tabs each time I start my computer and Opera.
I can't find ant way to turn this of in opera setting. The only way I found as quick fix is for now, is as quickly as possible use the show my workspace, function in taskbar.

I se that Vivaldi browser is working the same way as opera do now. Chrome doesn't.
I used Opera as my main browser since it came on the market, but if there's no way to fix it in settings or Opera fix it, I'm forced to switch to Chrome.

Thanks leocg

I have the start from last session enable in settings (Retain tabs from previous session).
So this is a question on definition of "last". For me the definition is like I describe how Opera worked previously. When I klick the Opera icon on my taskbar it open the last windows I had been using and not the rest 49 "unused".

This is from help.opera:
"Retain tabs from previous session – Opera resumes your previous browsing session when launched. All tabs left open when last using the browser will be open in your new browsing session."

My understanding of this text is like the "previous" way Opera worked. If not then there's a new question of definition on "Open". In my understanding "open" means uses or open on screen in the ongoing session. ALL the other is "unopen". Next time I start my computer Opera just start the "open" and not ALL incl the "unopen".

So what happens if i unchecked the "Retain tabs from previous session"??? Will Opera close all my "open" and "unopen" session so next time I start my computer all opera session/windows are gone??? Or will the sessions/windows be there so I can choose which I will start when I klick the Opera icon in taskbar???

I only experienced that Opera open ALL sessions in the last "weeks".

Solved!! Opera put it back to the old way we like it, them selves....

@kokalle No, I haven't got the time to test the solution that burnout426 suggested.. So far I just started the computer and made coffee... But I need to solve it..... Or I have to buy new computer with tons of RAM memory... When I get the time I've update my tread her with the result.
If you get the time to test, please let me know..

@burnout426 Hi, Thanks for answering my actual question!!! Now I know I haven't lost my mind I've try your suggestion to se if I get it back to the old days.....

Thanks leocg

I have the start from last session enable in settings (Retain tabs from previous session).
So this is a question on definition of "last". For me the definition is like I describe how Opera worked previously. When I klick the Opera icon on my taskbar it open the last windows I had been using and not the rest 49 "unused".

This is from help.opera:
"Retain tabs from previous session – Opera resumes your previous browsing session when launched. All tabs left open when last using the browser will be open in your new browsing session."

My understanding of this text is like the "previous" way Opera worked. If not then there's a new question of definition on "Open". In my understanding "open" means uses or open on screen in the ongoing session. ALL the other is "unopen". Next time I start my computer Opera just start the "open" and not ALL incl the "unopen".

So what happens if i unchecked the "Retain tabs from previous session"??? Will Opera close all my "open" and "unopen" session so next time I start my computer all opera session/windows are gone??? Or will the sessions/windows be there so I can choose which I will start when I klick the Opera icon in taskbar???

I only experienced that Opera open ALL sessions in the last "weeks".

In the last version(s) of Opera it began opening all my Opera windows when I start Opera from my taskbar (after I started my computer). I use Win 10. My Opera has auto update in settings, so I don't know exactly the version opera started doing this.
Previously opera started just the last "active" windows I was using (open on my screen) when I shutdown my computer.
To save energy and for other reasons I shutdown my computer when I don't use it (up to many times a day). I work in 30-50 Opera windows with several hundreds of tabs. Please don't start argue the way I use Opera or my computer!!
Previously my computer and Opera started quickly, but the way Opera works now it's very time consuming and so memory consuming that my computer become slow and useless, when Opera open All my windows and refresh hundreds of tabs each time I start my computer and Opera.
I can't find ant way to turn this of in opera setting. The only way I found as quick fix is for now, is as quickly as possible use the show my workspace, function in taskbar.

I se that Vivaldi browser is working the same way as opera do now. Chrome doesn't.
I used Opera as my main browser since it came on the market, but if there's no way to fix it in settings or Opera fix it, I'm forced to switch to Chrome.