GTmatrix
GTmetrix can help you develop a faster, more efficient, and all-around improved website experience for your users. Your users will love you for it.
GTmetrix uses Google Page Speed and Yahoo! YSlow to grade your site's performance and provides actionable recommendations to fix these issues.
Google Page Speed Online | Google
This is a brand-new service from Google that replicates it’s Page Speed service in online form. It’s focus is not on displaying a visual of the response, but rather on giving recommendations on how to improve speed.
loads.in | Site Performance
loads.in gives you the possibility to see how fast your (or any) website loads in a real browser from over 50 locations worldwide.
Websiteoptimization.com | Website Optimization
This service (and it’s accompanying documentation and guidance around optimization) is one of the best at giving recommendations on what to fix.
Whichloadsfaster.com | Which Site Loads Faster?
This site allows you to compare your site against another to see which loads faster. It also lets you do multiple tests in a row to get a better baseline. Hint: if you load faster than Google’s front page then you’re doing well.
tools.pingdom.com/fpt/ | Pingdom Load Time Test
Pingdom’s test service is perhaps the cleanest in terms of presentation. I find myself using this one quite often.
Browser Load Time Stopwatch | LifeHacker
This is also one of my most-used options for testing speed. It’s different than the others because it’s not a web page, but rather a piece of JavaScript that runs. You add the link to your bookmarks and execute it to test the page you’re currently on.
Google Chrome Page Speed | Extension
The Page Speed chrome extension is phenomenal for getting results that look like a local application in terms of detail and presentation.
Google Chrome Developer Tools | Built-in Tool
Many don’t realize that Google Chrome has a wicked-powerful set of tools built in. By opening the tools from the options menu you not only have the classics that let you manipulate JavaScript, see page layout, etc., but you also have a network display that lets you see what took the longest to load. It’s like a mini Page Speed display without the extension.
YSlow | Browser Extension
YSlow is like Google’s Page Speed, only not quite as advanced and available for more platforms. It’s now available for Chrome as well.
webpagetest.org | Web Page Test
This is another very solid web-based test that gives extremely detailed output with regard to what the request looked like from the browser.
Google Analytics | Google
It’s now possible to track load speed through Google Analytics. Simply get the latest version of the tracking script that has the functionality in it, and you’ll see it as an option within your metrics.
Google’s Webmaster Tools
Google’s Webmaster Tools has a Page Speed menu under Labs that shows you how fast your various pages have been loading. The options is very beta, however, as it gives you no control over what to test and not much information on what has been tested.
Pingdom’s Web Monitoring Service
This offering doesn’t test on demand like the others, but rather is an ongoing service that continuously tests pages that you define to let you know how their responsiveness changes over time. It’s very helpful for noticing how various techniques, like CloudFlare or Varnish, improve site load times. And since their servers are located all over the world, you get to see how fast your site loads from different countries as well.
This article first appeared on danielmiessler.com.