Hey, Li - uhm, if you have enough RAM to open 20 tabs at a time, I don't think you should care much about your browser's efficiency, ha-ha. However, with 32-bit Windows systems that only have 2 GB of RAM as well as 64-bit Windows systems that have 4 GB of RAM, you're looking at 4 tabs max. Otherwise some of the RAM's contents will go to the swap file making things painfully slow.
Worgarthe, Varta: Now that I think about it, you're both right. I should have tested Brave and Vivaldi, and Arc, too, I guess. That being said, Vivaldi doesn't have support for certain streaming media codecs that I need so this is why I don't take it seriously.
A, indy: I know however I did my best to subject the browsers to the same conditions. I think it's a fair enough comparison overall even if it isn't pefectly scientific or 'in-depth'.
Thanks,
Sergey