You may have something else bogging down your system. You should still see what actually is using up the CPU - if you're just web browsing, the CPU should basically be idling. I'm assuming that's for the whole system (you've got major problems if Firefox alone is eating a quarter of your CPU cycles). That having been said, you're saying you're seeing 25% CPU usage and 2.25GB physical memory usage. like toolbars, a ton of add-ons only adds to the memory footprint. Then there's also the issue of how long you leave Firefox running - they've never entirely been able to eliminate that long-reviled memory leak, so over time, it tends to gobble up more and more RAM even if you haven't opened a bunch of new tabs.Īnd then there's the add-ons. some sites are obviously more memory hungry than others. It also depends on what's being loaded on those tabs. For someone with 4 GB or less of RAM though, that can be crippling. In my case, with 12 GB (on my work computer) or 16 GB (on my home system) to throw around, that's a non-factor.
I typically have anywhere from eight to twenty tabs open, and Firefox regularly sucks up 700 MB to over 1 GB of system memory. The number of tabs doesn't necessarily mean the memory footprint will scale up radically - but it will increase. For 99 of people, hard drive utilization testing is pointless because it should only be saving the page to the cache and other browser data for a few seconds.
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