Performance Map

Performance Map

Heatmap of resources loaded in the browser using the Resource Timing API

  • Performance Map
  • Performance Map
  • Performance Map
What is Performance Map?
Performance Map is a Firefox add-on that generates a front-end performance heatmap of resources loaded in the browser using the Resource Timing API. It provides valuable insights into user experience by indicating when images finished loading and the time it took the browser to load each image.
Stats
Users: 44 ▼ -1
Rating: 5.00 (5)
Version: 1.2.0 (Last updated: 2019-05-15)
Creation date: 2019-05-15
Weekly download count: 4
Firefox on Android: Yes
Risk impact: High risk impact
Risk likelihood: Low risk likelihood
Manifest version: 2
Permissions:
  • tabs
  • activeTab
  • http://*/*
  • https://*/*
Size: 14.60K
Stats date:

Other platforms

Not available on Chrome
Not available on Edge
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Summary

PerformanceMap: front-end performance heatmap

Add-on to create a front-end performance heatmap of resources loaded in the browser using the Resource Timing API.

Usage

Wait for a page to fully load and then click WebExtension icon to overlay a performance heatmap.

The heatmap colours and the first ms value indicate at what point in the page load the image finished loading. It's a good indicator of user experience... "It took 3450ms before the user saw this image." The second value in brackets is the time it took the browser to load that specific image.

The legend attached to the bottom of the page shows timings for the full page load and hovering over a coloured area on the heatmap will move the timeline indicator to show you when that image was fully loaded.

Credits

It is based on open source project - https://github.com/zeman/perfmap

Safety
Risk impact

Performance Map is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Performance Map if you trust the publisher.

Risk likelihood

Performance Map has earned a fairly good reputation and likely can be trusted.

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