How much less In our tests so far, 64-bit Firefox reduced crashes by 39 on machines with 4GB of RAM or more.Also, with the jump from 32 to 64 bits, a security feature called Address Space Layout Randomization (ASLR) works better to protect you from attackers.Linux and macOS users, fret not, you already enjoy a Firefox thats optimized for 64-bit.Check your Firefox version (in the About Firefox window) and look for (32-bit) or (64-bit) after the version number.
You can still manually install 64-bit Firefox, if you choose. The memory usage results were also better and if you scale them up, the differences between 32-bit and 64-bit versions with multiple large website tabs open could be hundreds or even thousands of Megabytes. 64-bit could help if your browser constantly consumes several Gigabytes of RAM but they are mostly extreme circumstances. It used to run Internet Explorer close for top Windows web browser but these days has slipped to distant third behind Internet Explorer and more recently Google Chrome. Theres a lot to like about Firefox with the thousands of available add-ons, but also its had its fair share of problems with various performance and memory related issues over the years. An area where Firefox fell behind is making the browser a full 64-bit application to work better with 64-bit versions of Windows. A well coded 64-bit application should theoretically perform better and more efficiently than its 32-bit counterpart on a 64-bit operating system, usually at the expense of a bit more memory. Internet Explorer has had a 64-bit mode for several years, Chrome also has a version that was released in 2014. Firefox was the only major browser to not have a 64-bit version, until recently. Since version 42, Firefox has an official 64-bit version that you can download and install instead of the 32-bit version, although its currently not available on the main Firefox download page and is a bit hidden away in the Mozilla release pages. With this long awaited release, the question now is, does the 64-bit Firefox perform any better than the 32-bit version To find out weve put Firefox through a number of well known benchmarks and a few of our own to see what the differences are between the 32-bit and 64-bit versions. Weve included Waterfox which takes the Firefox source code and compiles it with 64-bit optimizations so it should run more efficiently and faster on 64-bit Windows computers. For comparison Firefox Nightly 64-bit has also been included to see if test versions are improving in speed and efficiency. Mozilla Firefox 42.0 Version 64 Bit Windows 7 Professional SP1To run the benchmarks each browser was installed on a clean and fully updated Windows 7 Professional SP1 64-bit. The hardware was an AMD Phenom II X4 955 CPU 3.2Ghz with 4GB of 1333Mhz memory and a 7200RPM HDD. We tested Firefox 42.0 32-bit, Firefox 42.0 64-bit, Firefox Nightly 45.0a1 64-bit and Waterfox 40.1.0, all settings were left at their defaults. JetStream The JetStream test is from Webkit and the successor to Sunspider. Its a series of Javascript benchmarks covering a range of workloads and scenarios, including tests from Octane 2 and Sunspider. Each test runs itself 3 times and an average score is given. Kraken Kraken was developed by Mozilla themselves but this test adds the time taken to complete each test together and gives a total score in milliseconds, so lower is better. Peacekeeper The company behind 3DMark and PCMark, Futuremark, developed this benchmarking tool. It tests things like DOM operations, HTML5, text parsing and rendering. Peacekeeper is no longer supported by Futuremark but still works. Octane 2.0 Octane is Googles own Javascript testing suite which replaces the popular V8 benchmark offering 9 additional tests and 4 more than Octane version 1. BrowserMark The BrowserMark suite tests a number of areas including browser resize, page load and requests speed, Javascript performance and tests for DOM, CSS and graphics speed. It should automatically choose your nearest regional server, manually select one if you want a different region. RoboHornet RoboHornet is a relatively new benchmark test and still in alpha. The default Core suite tests many areas including tables, DOM, CSS, canvas, scrolling and Javascript. Each benchmark runs itself at least 5 times which explains why the whole process takes around 15 minutes to complete. We used the Recommended Tests option. Mozilla Firefox 42.0 Version 64 Bit .Exe Which RisesNote: Firefox Nightly is at a disadvantage in these memory tests because it loads an additional plugin-container.exe which rises and falls in memory usage as the number of tabs changes. As it consumes extra RAM this process is included in the results. Tabs Open Memory Usage This test is again quite simple, the Raymond.cc homepage is loaded into 5 tabs and then after a few seconds the memory usage of Firefox is recorded. Tabs Open Memory Usage Similar to the test above apart from 25 tabs are open at once. Application Start Time Measures the time taken in seconds to load Firefox or Waterfox for the first time after a reboot (cold start). Results and Summary As you can see from the results in all 11 tests above, the 32-bit version of Firefox won an impressive 8 of the tests, only losing its number one position in the Kraken and Peacekeeper benchmarks and the cold start time. The memory usage results were also better and if you scale them up, the differences between 32-bit and 64-bit versions with multiple large website tabs open could be hundreds or even thousands of Megabytes. Gigabytes of RAM but they are mostly extreme circumstances.
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