You can just use the latest Nightly or Aurora to see how fast these things are compared to yours. I had a same problem, Firefox being slow and clunky so I switc

You can just use the latest Nightly or Aurora to see how fast these things are compared to yours. I had a same problem, Firefox being slow and clunky so I switched to Nightly and it did really increase the speed. I think Firefox is getting faster but fact is that users also acclimate to new speed and expect it to be faster. EDIT: Right now with about 10 tabs open FF is eating around 580 MB of RAM.