In terms of load speed optimisation, is Cache-Control: max-age=0
with an
If-Modified-Since
date a problem? My browser reports a 304, but tools like Google's PageSpeed and YSlow flag them as a problem on account of the short (non-existent) "freshness lifetime".
I've read through this question and some of the linked resources but, while helpful, I'm still not clear on the net effect (if any) for load speed.
Many thanks.