Firefox Quantum is super fast, while still conserving memory

At Firefox, we know that you’re looking for the fastest web browser out there. You need to load web pages quickly and work at top speed. To make sure the Firefox Quantum (‘57) is the fastest Firefox yet, we ran some tests*.

The tests compared Firefox Quantum (57)’s speed and memory against previous versions of Firefox, and of Chrome. They found that while results varied based on your computer and the apps you’re using, Firefox Quantum was approximately 2x faster than any previous version of Firefox.

Test 1:
Conducted on September 19, 2017 using Surface Laptop (Processor: Intel Core i7 / Memory: 8GB / Storage: 256GB ), a new Firefox profile, and no other apps or tabs running.

Test Firefox 52 Firefox Quantum (57) Beta
Test 1 35 67
Test 2 35 68
Test 3 35 67
Test Average 35 67

Firefox Quantum (57.0 b1 64-bit)
Firefox 52 (52.0 64-bit)

Test 2
Conducted on September 20, 2017 using MacBook Pro (15-inch, 2016) (2.9GHz Intel Core i7 / 16GB 2133 MHz LPDDR3 / 1TB PCIe SSD ), a new Firefox profile, and no other apps or tabs running.

Test Firefox 52 Firefox Quantum (57) Beta
Test 1 33 67
Test 2 32 65
Test 3 31 65
Test Average 32 66

Firefox Quantum (57.0 b1 64-bit)
Firefox 52 (52.0 64-bit)

In addition to speed testing, Firefox’s “just right” multi-process architecture results in Firefox Quantum consuming roughly 30% less RAM than Chrome.

To compare memory usage, the atsy project was used to load 30 pages, each in its own tab, with 10 seconds in between loads and 60 seconds of settle time at the end. Then memory usage was measured for the various processes that each browser spawns during that time.


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Mozilla is the not-for-profit behind Firefox, the original alternative browser. We create products and policy to keep the internet in service of people, not profit.