If you are on a shared hosting environment, I really recommend you to disable all JS and CSS minifying options. Sometimes, it makes the server even slower. What I do to make my website fast is:
- W3TC plugin: only page and HTML cache enabled (not object, no Minifying, no database)
- EWWW plugin: compress all my website images, including the theme images. This plugin is fantastic!
- Use Cloudflare, and there, I enable minifying of JS and CSS. It minifies it much easily than W3TC (really complex in my experience).
Using that, I get 91% in Pagespeed and 88% in Yslow:
http://gtmetrix.com/reports/www.lofotenresidents.com/2ZzdAMiH
I hope it can help you ;)
