[gsvelto]

If you could grab a profile of the problem with the Firefox profiler and file a bug it would be greatly appreciated. From the sounds of it it's probably an edge-case we're not aware of where Firefox performs very poorly. The problem with this kind of things in Mozilla is that we're often blind until someone brings up the issue and notifies us.

[kibwen]

Is the profiler a new addition? I'm on Nightly and I recently noticed the appearance of its little speedometer button in my toolbar and I'd be interested to learn more about it. The graphs it generates look nifty, but I have no idea how to interpret them.

[BeefWellington]

The profiler has been there for ages. It's definitely not new. They're moving where it's accessed but it's been under the Performance tab of the developer tools for a long time.

[3836293648]

No, I've heard of people using it for years. They probably just moved it to make it more visible

[babypuncher]

I'll try to get on that this week sometime

[lawgimenez]

There is also a lot of catching up to do on Firefox iOS. It is still crashing on heavy and large websites (government websites in my country) and then the more I used it, the more it lags and taking down the whole iOS system.

[KptMarchewa]

On iOS it's the same engine safari uses.