I have just implemented caching on my site using wp-cache. Overall the performance is much improved. The two pages that give me trouble are bfa_ata_file=css and bfa_ata_file=js. I removed those files from the wp-cache list so that they are not cached (I got strange css behavior otherwise). Since I can't cache the results, I want to cache them in the browser. What I have noticed is that these files are returned to the browser with a no-cache in the header. I want to change this so that they return a cache-able page. I know the point of externalizing the css was to allow the browser to cache them, but when the header says "no-cache, must-revalidate, max-age=0", it won't get cached. What php file is setting the header for requests to bfa_ata_file?

Where are you seeing the "no-cache, must-revalidate, max-age=0"?

See the attachment for where I see this using firebug

nothing to do with the theme, it is a server setting - see http://www.mnot.net/cache_docs/ for some info - you may be able to change this in your .htaccess file.

I am also finding very slow loading of Atahualpa - 3-4 seconds, see http://wordpressacademy.biz, some other themes I have seen load in a second even with lots of data (although I would have to install on my site and test and I can't do that right now.

Unlike the user above, I installed w3 cache and it made no difference, despite verifying that it works and that some things are accomplished (like minifying the html, css and javascript. So it's not a host-side execution or CPU problem.

I run Firefox plugin Page Speed and it reports 6 javascripts, about 20 non-cached images ("expiration not specified"), and 3 css. This doesn't sound too bad, but why is it so slow?

Could the 20 non-cached images be the culprit, should I contact my host to see about that?

Is anyone here getting page load times of less than 3 seconds on their Atahualpa sites? If so please let me check...

Ok, correction, I installed wp super cache on http://wordpressacademy.biz and it seems a bit faster (maybe 2.5 seconds rather than 3) but still a lot slower than a static site. I could use some help on this one.

Btw I gather w3 cache is the better cache plugin but I really do NOT want caching of logged-in users as I have a membership system going there and I don't know enough about w3 cache to guarantee that is not happening