Ok, problem with Mastadon: In Firefox it incures a SIGNIFICANT amount of CPU. Firefox suddenly starts using an average of 10-20% of my CPU, a i5 M 540 at 2.5 GHz.

Only web applications could make copying data off the internet and displaying it on screen take that much CPU.

Testing in Chrome now. Seems fine so far. Still about 5% of CPU, which is pretty crazy for rending text and a few images.

WTF, do I blame Firefox or the person who wrote Mastadon?