Scripting Performance

As websites have gotten more and more complex, the browser’s scripting performance has continued to be extremely important. To quantitatively analyze this performance, we turn to several web-based scripting tests. The specific tests we normally leverage are being expanded to include a wider variety of workloads to get a better handle on how each browser can handle them. And, just for fun, we are including some incredibly old scripting tests just to show why they are not used any longer.

As far as hardware we are turning to the Microsoft Surface Laptop 3, featuring the Intel Core i7-1065G7 which is based on Intel’s 10 nm Ice Lake platform. It is set to run in its maximum performance mode during these tests to give the CPU its maximum boost.



Rather than focus on a specific function, Principled Tehcnologies developed WebXPRT to simulate several real-world tasks with HTML5 and JavaScript, including photo enhancement, OCR scanning, AI, and more. If you would like to delve into how this benchmark works, and how the score is calculated, check out the report on WebXPRT as well as scoring.

In this first test, Firefox is the clear winner, easily outclassing all of the Chromium browsers which are all within a few points of each other. Interestingly, classic Edge and new Edge are almost tied. Internet Explorer does not fare as well.

Speedometer 2.0

Speedometer 2.0

Created by Apple’s WebKit team, Speedometer 2.0 is a relatively simple test which involves adding, completing, and removing items in a to-do list. Speedometer 2.0 was created to measure the browser responsiveness. The test performs the to-do tasks with some of the most popular JavaScript frameworks available, and the score is a geometric mean of the different implementations of the to-do app, and then an arithmetic mean of the geometric means for each iteration. Apple warns against comparing the scores of different browser engines as they will do different work, which is why we use the same browser in hardware reviews.

For this test with different browsers, the scores are actually fairly similar for most browsers, although classic Edge and Internet Explorer both do poorly, with the latter not even loading the page. Interestingly, Chromium Edge does outperform the other Chromium browsers by a few points here.

JetStream 2

Jetstream 2

Combining JavaScript and Web Assembly benchmarks, and featuring 64 subtests, JetStream 2 includes part of some older popular scripting tests such as SunSpider and Octane 2, and each benchmark is weighed equally in the results with a geometric mean over each individual benchmark score to provide the final JetStream 2 score.

Again, we see Microsoft’s Chromium Edge slightly edge (pun intended) the other Chromium browsers. Mozilla Firefox is not quite as fast here as the Chromium browsers, and classic Edge and Internet Explorer both failed to load the test at all.

Octane 2.0

Octane 2.0

The original Octane was released in 2012, and the later Octane 2.0 was one of the most popular scripting performance benchmarks around. It focused on peak scripting performance, and as is the case, over time browser scripting engines had optimized their code to solve many of the bottlenecks that Octane was originally designed to put a spotlight on, and as such, the benchmark was retired by Google in 2017. New bottlenecks that were not being represented in Octane were common in popular sites, and this is a typical scenario with all benchmarks, but the web moves at a rapid pace.

Here we see some wide variation in results, with Chromium Edge again at the top of the stack, followed closely by Opera, and of course both are based on Chromium, but Google Chrome was not as performant on this test. All of the Chromium browsers did outperform all other browser though, with Firefox slightly behind Chrome here. Classic Edge was a bit further back, and of course Internet Explorer with its very outdated scripting engine was far behind the rest, although at least this test did run in IE 11.

Kraken 1.1

Kraken 1.1

Created by Mozilla, Kraken runs several test cases from real-world applications and libraries, and includes 14 subtests. Results are reported in milliseconds to complete the tests, and as it is time-based, lower results are better.

Mozilla Firefox is our fastest browser in this test, although only by a hair. Again we see Microsoft’s implementation of Chromium Edge outperform the other Chromium browsers, although all of them are in the same range of results. Classic Edge takes a definite step back in performance here, and Internet Explorer trails the pack by a wide margin.

SunSpider 1.0.2

Sunspider 1.0.2

The last version of SunSpider was 1.0.2. Once this was likely the most popular scripting test around, and likely due to that, developers optimized their code to quickly overcome this test, and then found ways to work around it. SunSpider was retired and is no longer a relevant test, but since it is not too difficult to run, it was added just to see how modern browsers perform on it.

Interestingly Internet Explorer, and the newer browser based off of its code, classic Edge using EdgeHTML, both perform suspiciously high on this now retired benchmark. Whether that is due to Microsoft’s Chakra scripting engine still containing “optimizations” for SunSpider is somewhat irrelevant, as not only has the benchmark been retired, but both Internet Explorer and classic Edge are both also defunct as well.


With so many browser makers now using Chromium as their base, and contributing to its code, it should not be a huge surprise to see the Chromium browsers offering the highest scores here. Firefox does very well though, only a couple of points behind. Classic Edge, which has not been developed for over a year, is still quite compatible, but poor Internet Explorer is way behind the rest.

Introduction HTML 5 Compatibility and Web Browser Battery Life
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  • Tomatotech - Thursday, September 10, 2020 - link

    Poor Fred. How is he nowadays?
  • tipoo - Friday, September 11, 2020 - link

    On the street and dried up, apparently.
  • Lezmaka - Thursday, September 10, 2020 - link

    I'm guessing Chromium Edge is faster since it's not constantly sending every action to Google.
  • PeachNCream - Thursday, September 10, 2020 - link

    Yeah, Google is yet again in legal peril over non-consensual data collection in Chrome. There are lawsuits in Canada and the US over data collection while incognito and data collection without Chrome sign-in. Bottom line is that Google is a disgusting, filthy company with a business model that lives and dies on collecting, compiling, and mining your data across multiple products.

    Browser performance can climb into the back seat and get in a long line behind concerns about my browser not selling me out to revolting home invaders like Google and the other tech companies that present their products and services as oh-so-beneficial and helpful to me. I'll wait a few seconds for a tab to load if my browser isn't selling me off to the mothership.
  • eastcoast_pete - Thursday, September 10, 2020 - link

    Appreciate that point, especially when running Linux, those can be reasonably snappy. But, as your comment also suggests, I believe those low-end laptops are a good testing platform for which browser is able to stay usable with many tabs open despite limited memory and computing power. Brett's test system is already quite well equipped with both of those, and unlikely to run out of either.
  • sonny73n - Friday, September 11, 2020 - link

    You’re spot on about Google. Chrome automatic updates can’t be disabled in Group Policy or changed to manual. Goggle services constantly running in the background probably to collect your data. And when you uninstall Chrome, it would leave traces everywhere all over your system. They’re truly a disgusting and filthy POS. I’m glad that some phones are without Google services.
  • sonny73n - Friday, September 11, 2020 - link

    Hey Google, I’m glad that you banned some Chinese manufactures from using your spying services. I’d rather have the Chinese spy on me. You’re the evil with no human decency, moral and ethic. You’re just a low life scum working for the Deep State mafia. Time to get rid of you.
  • Lord of the Bored - Sunday, September 13, 2020 - link

    Google didn't ban any chinese manufacturers from using their services. The US government did, and China banned its residents from using several more services because they weren't censored enough and contained factual information that made Emperor Pooh Bear look bad
  • imaheadcase - Thursday, September 10, 2020 - link

    I never understood the whole best browser, it really just comes down to what you like best. On a normal PC it won't make one difference to a user anymore.
  • heffeque - Thursday, September 10, 2020 - link

    For some people it's a matter of which one makes you feel less of a product.
    Personally I switched back to Firefox after Google did something with Chrome which I very much disagreed with (I don't remember what anymore, but I remember that it was the last straw) and although it has a few quirks here and there (especially the Android's latest version) I'm happy to have done it. Google/Microsoft have too much power regarding the web browsing, and going Firefox is the best way to fight their supremacy.

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