New Firefox

It is worst of all. Just starting it, without opening any pages, already takes 600 Mb. It constantly accesses HDD and stops the world of garbage collection or page unloading or something. How can something be that bad?

They advertise FF as faster and optimized, but in reality Firefox slows PC so much, that even mouse cursor stops moving. I don't understand why typical web page should take more than a megabyte to display.