Performance
Browser Extension system requirements and performance optimization information
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Browser Extension system requirements and performance optimization information
Last updated
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PixieBrix resources depend on the number of mods activated, the number of frames where those mods are running, and the size of those mods.
The following are estimates for normal PixieBrix usage:
Hard Drive Storage:
Browser Extension (Unzipped): 36.4 MB. Note that Chrome has a long-standing bug where older extension versions are retained on disk after updates. If hard-drive space is limited, you may need to run a recurring job to clean old versions of the extension.
Package Definitions: 5-25 MB. Package storage space depends on how many mods the user has access to and the size of those mods (e.g. if the mod includes embedded images directly in the package definition.)
Memory
Baseline: 34 MB
Peak: 130 MB. Note that Chrome runs memory garbage collection automatically based on available system memory.
Open the Chrome Task Manager, by clicking Chrome's 3 dot menu and selecting More Tools > Task Manager.
Locate the entry for Extension: PixieBrix.
If the Memory Footprint column is not visible, right-click on the header row and select "Memory Footprint" to show that column.
Lighthouse is a tool in Google Chrome to measure page performance and quality. To measure the impact of browser extension on page load, you can:
Run a Lighthouse performance report without the extension active
Run a Lighthouse performance report with the extension active
For each, Lighthouse will generate a report with an overall score as well as other key performance metrics, e.g.: First Contentful Paint and Total Blocking Time.
Modern Chromium browsers (e.g., Chrome and Edge) include a Memory Saver mode that automatically frees memory on inactive tabs until they are revisited. The browser will also free up PixieBrix's memory from those inactive tabs.
Verify your Memory Saver settings: chrome://settings/performance
By default, PixieBrix includes a small bootstrap content script on each frame. PixieBrix then dynamically imports content required to run mods as necessary.
To limit memory utilization, you can set an IT policy restricting PixieBrix to only run on the necessary origins. See Browser Extension Security for instructions
Contact [email protected] to turn on the ability to view Extension Storage Statistics for the impacted account.
When the flag has been enabled, instruct the user to:
Visit the Admin Console to refresh their settings
Visit Visit Extension Console > Settings to view the statistics
The Extension Storage Statistics card list the hard drive utilization. For example:
Chrome displays a "Aw, Snap" crash on the tab
The tab used too much memory
Check your hard drive free space. If the hard drive is full, Chrome cannot use swap file system to temporarily store memory on the hard-disk
Chrome displays a "Page Unresponsive" popup
There is an infinite loop, or high CPU utilization has prevented repainting the page
Audit the PixieBrix mods to ensure there are no infinite loops. For example, a state change trigger modifying a mod variable
Content is loading slowly on the page
Slow network connection or slow host website
Check the network connection speed
Page animation transitions are laggy after load; panes in the host app temporarily show blank content
An inefficient mutation or intersection observer is slowing down repaints
Audit mod button/trigger selectors to ensure efficient native CSS selectors are being used
See
