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What are some good tools/programs/websites were i can test various aspects of my website? for example loading speed/cache usage/image compression/SEO’s etc?
https://developers.google.com/speed/pagespeed/ Codekit for minify and img compress
The inspector in Chrome has a lot of those things built-in.
I recently wrote a little blog post about it: http://hugogiraudel.com/blog/tools
Add WebDev Tools (Chrome) or Firebug (Firefox). :)