I just decreased my page load times from 3-10 seconds even on refresh (extremely annoying and damaging in all ways) to less than 1 second, even for logged-in users (that in theory are not being cached). I followed procedure in this excellent article:
http://www.wpbeginner.com/plugins/ho...for-beginners/
And this one:
http://netdnacdn.jira.com/wiki/displ...W3+Total+Cache
For installing W3 Total Cache plugin and MAXCDN (a CDN or content delivery network) to my site. MAXCDN costs $40 the first year ($30 with the wpbeginner discount code, check the article) and then $99 a year after that. I am a commercial provider so this was a no-brainer, however, I think that excellent results could be had just by setting the w3 cache image , css and js expiration settings (to encourage browser caching) through W3 cache > Browser cache setting and then enabling all the settings (set expires header, set cache control header etc)
This is a huge relief as Atahualpa was becoming unmanageable with 6-7 javascripts, large CSS files and lots images on my sites.