Fixit – Cookie Size

This test determines if your page is generating excessively large cookie data. Cookie data must be transmit by the browser with each HTTP request, so excessive cookie data will directly affect transfer speed and result in slower page load times.

Checking for excessive Cookie data

This test checks to see if cookie data exceeds 1kb. If enough cookie data is detected then the test reports a FAIL.

If you receive a FAIL for this test, you should consider researching cookie reduction techniques such as session identifiers.

Reference

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