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I can run lots of performance tools on my server, but what is with problems that are only visible from the outside? Are there any tools that can help me with this?

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Any particular kind of problems or just a general "health check"? –  delete Jul 15 '10 at 3:52
    
Just general health checks –  txwikinger Jul 15 '10 at 4:40

4 Answers 4

up vote 4 down vote accepted

Check out http://www.webpagetest.org/. You can run tests against your site from a remote server and it will tell you how long any page took to load and how long each component took to load.

The site uses multiple servers around the world so you will be able to check if you have speed differences due to location.

This is still in the VERY early stages but you can capture a video of the page load for viewing and visually comparing to other pages.

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I like this very much! –  txwikinger Jul 15 '10 at 4:46

Google's Webmaster Tools is a good start. Also take a look at the W3C Markup Validation Service.

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Interesting. I will try this. –  txwikinger Jul 15 '10 at 4:47

It's not an online tool strictly speaking, but take a look at Yahoo! YSlow. It's a Firefox addon that integrates with Firebug.

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Yes.. I have this too. –  txwikinger Jul 15 '10 at 4:46

One tool that I use regularly is the domain report at DNSStuff.com. It's tests are mostly related to DNS and the domain name itself, but it can identify a number of things at the low level which can dramatically impact performance higher up the stack. I recommend running a DNS testing tool like this in addition to higher level tests to have all the bases covered.

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