It reminds me of Phoenix (to become Firefox), and how much of an improvement it was over the Mozilla browser. It makes me wonder where things went wrong, as I recall the Firefox of ~2005 being snappier than the one of ~2015. The only discrete drop in performance that I can remember was the addition of the AwesomeBar (which was worth it, but it really annoyed me at the time that just typing in an address became sluggish). Of course, my memory about these things could be completely wrong, and in any case web 2.0 gradually took over and websites accreted JavaScript faster than the hardware could improve, so comparing today with 10-15 years ago isn't really fair... Well, congrats to the Firefox developers, because it really is a pleasure to use again.