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----
-breadcrumbs:
-- - /developers
- - For Developers
-- - /developers/design-documents
- - Design Documents
-- - /developers/design-documents/extensions
- - Extensions
-- - /developers/design-documents/extensions/how-the-extension-system-works
- - How the Extension System Works
-page_name: chrome-benchmarking-extension
-title: Benchmarking Extension
----
-
-The Chromium Benchmarking Extension is a quick-and-dirty way to test page load
-time performance within Chrome.
-
-### Features
-
-* Can clear the cache between each page load
-* Can clear existing connections between each page load
-* Works with both SPDY and HTTP
-* Measures time-to-first-paint, overall page load time KB
- read/written, and several other metrics
-* Can compare performance between SPDY and HTTP
-
-### Requirements
-
-* Chrome version 7 or later
-* Command-line flag "--enable-benchmarking" should be used to start
- chrome
-
-### Screenshot
-
-> ### [<img alt="image"
-> src="/developers/design-documents/extensions/how-the-extension-system-works/chrome-benchmarking-extension/benchmark-sm2.png">](/developers/design-documents/extensions/how-the-extension-system-works/chrome-benchmarking-extension/benchmark-sm2.png)
-
-> ### [(Click to
-> enlarge)](/developers/design-documents/extensions/how-the-extension-system-works/chrome-benchmarking-extension/benchmark-lg.png)
-
-### Instructions
-
-> **Option 1: Use the benchmark from the chromium source code**
-
-> The benchmark is part of the chromium source code. You'll find it here:
-
-> &lt;path-to-chrome-tree&gt;\\src\\chrome\\common\\extensions\\docs\\examples\\extensions\\benchmark
-
-> To run Chrome with the benchmark, use the following command line:
-> chrome.exe --enable-benchmarking
-> --load-extension=&lt;path-to-chrome-tree&gt;\\src\\chrome\\common\\extensions\\docs\\examples\\extensions\\benchmark
-> **Option 2: Install from Chrome Extension Gallery**
-> Install the extension from Chrome Extension Gallery following [this
-> link](https://chrome.google.com/extensions/detail/channimfdomahekjcahlbpccbgaopjll).
-> Then you'll need to restart the browser to use it.
-> When you run chrome, use:
-> chrome.exe --enable-benchmarking
-> As of M34, the method that seems to work is to load the source code as an
-> unpacked extension after enabling developer mode and use the flag
-> --enable-net-benchmarking in addition to --enable-benchmarking
-
-Options
-
-> * Iterations: How many times the test page should be loaded to
- collect performance date.
-> * Clear Results: Clear result table.
-> * Clear connectons: Reset the internal socket pool, oherwise chrome
- will reuse the socket connections if possible.
-> * Clear cache: Reset the cache, otherwise chrome could load the page
- from cache if possible.
-> * Enable Spdy: Use spdy to load a page. When enabled, if the web
- server does not support spdy, an error is reported and test will
- stop.
-> * URL to load: A comma separated list of urls to collect performance
- date. Note, the urls listed here should be the final url. E.g.: if
- url1 will be redirect to url2, url2 should be used. Otherwise, an
- error will be reported and test will stop. You can use "Load URLs
- From File" to load the comma separated url list from file if your
- test set is large. \ No newline at end of file