The internet browser is the most important tool on a mobile device. It is the engine for browsing the internet. No longer just for websites but also now for new types of applications based on web technologies (progressive web app, games, etc.).
For this new edition of our ranking, carried out in 2018 and 2020, we have chosen to compare 16 mobile applications: Brave, DuckDuckGo, Chrome, Ecosia, Edge, Firefox, Firefox Focus, Firefox Nightly (formerly Firefox Preview), Kiwi, Mint, Opera, Opera Mini, Qwant, Samsung, Vivaldi et Yandex.
The objective of these measures is to see how the solutions stand in terms of environmental impact (Carbon) in relation to each other on common user scenarios but also to provide benchmarks on our uses of browsers.
For each of the 16 applications measured on a Galaxy S7 (Android 8) smartphone, the scenarios integrating the launch of the browser, browsing on 7 different websites, periods of inactivity, etc. were carried out through our Greenspector Test Runner, allowing the performance of automated tests.
Learn more about our methodology
Total energy consumption (in mAh)
The average power consumption is 49mAh (as a reminder, the 2020 ranking average was 47mAh or -4.2%).
Here is the evolution from last year.
|2021 Ranking||2020 Ranking||Évolution|
Firefox Focus is the best solution in terms of energy consumption in our comparison. The version evaluated in 2020 was one of the first versions and it seems that Firefox teams have been working on optimizing the power consumption of their browser since. Ecosia loses its leading position on this indicator and finds itself in the middle of the ranking. On the side of the most energy-hungry browsers, we find Mint and Opera Mini. Note that the most popular browsers: Edge, Firefox, Chrome, and Samsung, are quite poorly classified.
This total energy consumption can be evaluated and analyzed in 2 ways: the energy consumption of pure navigation and the energy consumption related to the functionality of the browser.
Energy consumption of navigation (in mAh)
Navigation is the consumption only associated with viewing the page (no consideration of launching the browser, features, etc.).
Most browsers have a fairly similar power consumption on “pure” navigation. This is mainly due to the use of visualization engines. Most browsers use the Chromium view engine.
Compared to the 2020 ranking, it seems that the Firefox engine has improved. Qwant, using this engine too.
Energy consumption of features (in mAh)
The functionalities include browser states such as idle periods, launching the browser, writing URLs in the navigation bar.
By keeping the same classification as for the total energy, we see that the non-navigation functionalities (writing of URLs, inactivity of the browser, etc.) have a significant impact on total consumption.
Battery life is the number of hours the user can surf before the battery is completely discharged. The ranking does not change with respect to that of energy, as autonomy is directly related to energy.
We observe that the autonomy can double from 5h to 10h between the most consuming browser (Mint) and the least consuming (Firefox Focus).
Data (Volume of data exchanged) (MB)
Some applications do not manage the cache at all for reasons of data protection and privacy, use proxies that optimize data, have a difference in the implementation of cache management. In addition, if a browser is good, the downside is that a lot more data is potentially loaded in the background. In our methodology, we see it for the New York Times site, which is larger in terms of data.
Here is an example of the measurement iterations on the Amazon site (Amazon.com) that shows the difference in data processing between different browsers.
Memory consumption(RAM) by the browser process (MB)
Memory consumption is important to take into account in a digital service because even the variation in memory consumption does not influence the energy impact, it remains very important to integrate because of the effects of overconsumption on already congested devices. in memory, or older, less powerful, this can create instabilities or applications that cannot operate simultaneously because they compete. In ecological terms, this can of course provides a premature change of device on the user side for a more powerful model to satisfy good user comfort.
The variation goes from 400MB to 1.8GB (approximately half the RAM of the Samsung Galaxy S7).
Let us observe more precisely the behavior of the memory following the sequence:
At the launch of browsers, we have a median memory usage of 413MB. Edge consumes a lot more with 834MB.
If we leave the browser inactive, the memory consumption of most browsers remains fairly stable. Which is pretty good and normal. On the other hand, we see that Edge and Ecosia have a strong increase in memory.
Then, with navigation, the memory consumed increases significantly. This is due to the consumption of navigation engines to analyze and store items. The management of tabs will also play a role. If the browser offloads the memory for the non-active tabs, then the consumption will be lower.
We can note that Firefox Focus, Mint, Duck Duck go, Opera Mini and Qwant overall consume little memory.
When the browser is closed, almost all browsers are no longer in memory. Firefox remains however with 1, GB as well as Chrome and Mint with around 100MB. Probably a bug but it is annoying because elements still occupy the memory and processing operations can also exist: processing operations are confirmed on Firefox and Mint with the rate of CPU consumed by the browser process which remains high.
We can also look at the memory impact of consulting Wikipedia (the basic consumption of the browser is subtracted here).
We understand the difference in memory management between browsers and the potential entropy on heavier sites.
We measured the time it took to write the URL in the address bar.
This difference in performance can be explained by several factors: network exchanges during entry (auto-completions), processing during entry, search based on known addresses, etc. In the end, for the user, the time to access the site will be longer or shorter. For example on the Wikipedia URL entry on Duck Duck Go a lot of network traffic and CPU processing (peak at 22% CPU).
Unlike the faster Edge which has lower processing in terms of CPU.
By the way, we could have an optimization of all the browsers by limiting its treatments (for example by grouping and spacing the treatments).
The environmental impact is calculated according to the Greenspector emission factors taking into account the energy consumed and the wear of the battery (impact on manufacturing). The impact of the network and the data center is taken into account with the internet intensity.
This impact is reduced to the consultation of a page.
Firefox Focus by its low consumption is first. Samsung, which has average power consumption, is in second place thanks to good data management.
The most impactful browsers (Ecosia, Edge, Mint and Opera Mini) have high power consumption and poor data management..