Online test to help speeding up heavy web pages

Free and open source!

Choose the simulated device:
Desktop
Tablet
Phone
[ Advanced settings  ✚ Hide advanced settings  ✖ ] Currently set: wait for selector cookie authentication
Cookie
Cookie

Adds a cookie on the main domain.

Example: "bar=foo;domain=url"
Authent
Basic HTTP authentication

Enter your credentials here if you need to bypass a basic authentication.

PS: if your authentication is not basic, you might be able to copy the session cookie from your browser, paste it in the "Cookie" setting and launch a run before your cookie expires.
username
password

Front-end quality

Audits quality problems in the HTML, CSS and JS

WebPerf

Checks if performance good practices are applied

JS Profiling

Untangles the JavaScript spaghetti code