Measuring Performance

Really perfect writeup of current offerings of page speed test tools.

WebPagetest
There is also an CLI tool: marcelduran/webpagetest-api and you can script WPT:
```
setCookie https://www.save-up.at etk-private=1
navigate  https://www.save-up.at
```
GiftOfSpeed
GTmetrix checks both PageSpeed and YSlow metrics.
Pingdom Website Speed Test
KeyCDN Website Speed Test is a new kid on the block, but as usual, it is very professional.
Uptrends
DareBoost can also launch competitive benchmarks.
Pagelocity is really not that bad.
Dotcom-Tools
PageScoring.com
Yellow Lab Tools
CA App Synthetic Monitor has Switzerland tests.
Varvy Pagespeed Test

WebPagetest can show all the public test history, but Pingdom has a free monitoring.

FeedTheBot is the best tool to test bth the speed but also a compliance with Google’s recommendations. The same site contains beautiful SEO tool.

Google PageSpeed Insights
SiteSpeed.me is a great idea. It will check site availability and speed from different spots around the world.
WhichLoadsFaster will load two sites in parallel and compare their speed. Very interesting.
Show Slow collects performance metrics over time from YSlow, Page Speed Insights, WebPageTest and dynaTrace AJAX Edition rankings.

Check HTTP headers and explain them with REDbot.

Waterfall charts explained

Desktop tools for Web Debugging & Performance Testing: Fiddler

Some new resources to measure site performance: