Msg#: 4291646 posted 12:09 am on Apr 4, 2011 (gmt 0)
Firefox performance is extremely important to our users, especially how quickly it starts up and loads websites. Customization is also extremely important, and while most add-ons cause only a tiny performance impact, others can significantly slow down Firefox. Many users donít realize add-ons can cause these delays, and thatís why weíre committed to improving performance in a big way. How slow are we talking about?
On average, each add-on you install adds about 10% to Firefox start-up time. For some users thatís mere milliseconds, and for others it may be half a second; it all depends on the hardware and software of each individual. Many add-ons add less than 10%, and unfortunately, there are quite a few add-ons that add more. But based on our real-world performance data, installing 10 add-ons will double Firefoxís start-up time.