I was happy to find that setting #extended-lazy-session-loading to Disabled would simply stop all tabs but the one I was viewing from loading at startup. This saves me tons of times and memory.
Today I found this flag removed from the Developer build. PLEASE, Opera, Great Browser, Faster than Firefox, Better than IE/Edge, please do not ditch this flag, at least make it an option. You know, "Do not load tabs until selected". I have a lot of youtube pages open all the time and loading those in the background still slows down Opera. At least on my crap Win10 computer with 4 gb of ram.
I really don't want to go back to Firefox
I'll do what I can to make this happen. I'll hold a lone vigil, light a candle, plant a tree, better monitor my carbon footprint. I'll sing Opera's praises by howling at the moon on a clear sky, I will wash my feet with lavender twice a week and stop smashing mosquitoes that try to sting me. I will be one with Gaia the Mother of all Life, chain myself to the tree I planted and make sure no one cuts it down.
I'll also mail you a blank check! Might have the word VOID on it, but gosh darn it, it will be blank!