We have just launched www.safari.co.uk, and its working really nice - apart from the speed. We really need to improve page load times and optimise the image library.
Can anyone sign post me to ideas / guidelines. I think there is a lot of performance to be gained in the cache of cropped images that could be served as static image instead of having to pass through the GD library everytime (or is this already happening?).
Looks like a brochureware site - so http://doc.silverstripe.org/framework/en/reference/staticpublisher - could be a huge win.
If you want to do a partial cache...
Then you have the more complicated server setup... APC, memcache, varnish (http://en.wikipedia.org/wiki/Varnish_(software)).
Lastly, of course is analysing your site with something like kcachegrind and improving the code you have added :)