Well, after all day using it, at least in my slow HP Chromium is faster than Palemoon, as I can manage until 10-11 tabs open before my PC gets lazy with Chromium I got the same with only 5-6 tabs in Palemoon. Even when I'm writing this lignes my system has become unresponsive with 6 tabs and I'm finishing them with my phone.... As I can I'll edit this post with some screen shots of system monitor...
EDIT: i'm now writing from Chromium, and I opened the same 6 tabs that I had when I must kill palemoon, those are the captures of system monitor:
Palemoon with 6 tabs opened (including ProtonMail, LinkedIn and Accuradio playing music):
Now I close Transmission as I suppose that it was guilty of RAM consommation, but the result is the same:
We can see that palemoon is an unique big memory eating process below:
When I kill palemoon this is the result:
An now, Chromium, with the same 6 tabs opened and the same other apps running minimised:
As we can see chromium divides memory usage in a lot of small memory processes that I suppose they are "sleeping" until we don't call them, maybe....
Hoping those results may help.....