Fixit – Duplicate Resources

This test determines if your page makes use of duplicated resources. Including the same Javascript file or CSS file for instance will likely result in double the transfer time and will impact page load time. Duplication of page resources is typically the result of human error and should be avoided whenever possible.

Checking for duplicate resources

This test checks to see if there are any duplicated resources being requested by the page. If duplicate resources are detected in use on the page then the test reports a FAIL.

If you receive a FAIL for this test, you should determine which resources are being duplicated and correct the problem.

Reference

This test is based on a YSlow best practice. See http://yslow.org/faq/ for more details.