Discover which extension is causing the most slowdown in your browser, according to Chrome report

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Title: The Impact of Chrome Extensions on Browser Performance: Insights and Recommendations


Chrome extensions have become an integral part of enhancing internet browsing experiences by adding functional features to the browser. However, not all extensions are created equal, and some may inadvertently slow down the browser’s performance. In this article, we will explore the impact of different Chrome extensions on browser performance, providing valuable insights and recommendations for optimizing your browsing experience.

Understanding the Impact of Chrome Extensions

The development team at DebugBear, a web page optimizing service, conducted an analysis of 5,000 extensions to determine their impact on Google Chrome’s performance. Their findings revealed that certain extensions can lead to longer load times on websites, depending on how they process data.

Extensions that process data “before a page has rendered” were found to have a significant negative impact on user experience. Virtual Private Network (VPN) extensions were identified as among the worst offenders, causing delays of up to a full second. This can be attributed to the fact that VPNs route internet traffic through an intermediary server, adding an extra layer of processing.

Other extensions that may cause long load times include Trancy AI Subtitles and Klarna Pay Later. These extensions, which process data before page rendering, can lead to slower website performance. However, it is important to note that not all extensions have a detrimental effect on load times.

Extensions that run their code “after the page has loaded” also have the potential to impact Chrome’s performance, albeit to a lesser extent. Processing times can slow down web page interactions, but the severity of the impact varies. Take the Monica AI Assistant, for example, which adds 1.3 seconds of processing time but actually reduces page load speeds. This is because extensions like Monica start running as soon as the page begins loading.

The Role of Page Interactions

Even if an extension does not directly result in slow load times, it may still contribute to slow page interactions. For instance, Avira Password Manager introduces a 160-millisecond delay when clicking on random content headings. While this delay may seem negligible, it is important to consider the cumulative effect.

When multiple extensions are enabled, each contributing a delay of 160 milliseconds, the overall performance of the browser may be significantly compromised. It is essential to be mindful of the potential accumulation of delays caused by multiple extensions.

The Positive Impact of Ad-Blockers

While some extensions may negatively affect performance, ad-blockers have been found to improve browsing experiences. Websites with excessive ads can significantly slow down page loading times. DebugBear’s analysis revealed that without an ad-blocker, the average CPU processing time on ad-heavy websites was 57 seconds. However, with the installation of uBlock Origin, this time decreased to just under 4 seconds, providing substantial savings in terms of power consumption.

Among the best ad-blockers for Chrome are uBlock Origin, Malwarebytes, and Privacy Badger. On the other hand, AdBlock Plus was identified as one of the worst performers, consuming over 40 seconds of processing time.

Recommendations for Optimizing Chrome Extensions

If you are experiencing a slowdown in your Chrome browser due to installed extensions, there are a few actions you can take to mitigate the issue.

1. Uninstall or restrict offending extensions: The easiest option is to remove the extensions that are causing the slowdown. If you find a particular extension valuable but notice its impact on performance, consider restricting it to enable only on specific websites where its functionality is necessary.

2. Utilize Chrome Extension Performance Lookup tool: DebugBear provides a useful tool to analyze the performance of Chrome extensions. The Chrome Extension Performance Lookup tool helps users identify lightweight extensions that have a minimal impact on performance, providing a more seamless browsing experience.

3. Choose the right ad-blocker: To optimize browsing speed, selecting the right ad-blocker is crucial. uBlock Origin, with its high performance and ability to significantly reduce processing time, is recommended. However, there are other viable options available as well. TechRadar’s list of the best ad blockers for 2024 can provide additional insights and recommendations.


Chrome extensions can be valuable tools for enhancing browsing experiences, but it is important to be aware of their potential impact on browser performance. Our analysis has shown that extensions processing data before page rendering or implementing code after page loading can have varying effects on load times and web page interactions.

Additionally, while some extensions may slow down Chrome, others, particularly ad-blockers like uBlock Origin, can significantly improve performance by reducing processing time.

To optimize your Chrome browser, it is advisable to uninstall or restrict extensions that detrimentally impact performance. Using tools like DebugBear’s Chrome Extension Performance Lookup can help identify lightweight extensions that minimize performance issues. Finally, selecting the right ad-blocker can enhance your browsing speed and overall experience.

By applying these recommendations, you can ensure that your Chrome browser remains fast, efficient, and optimized for a seamless browsing experience.

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