How to specify expiration of cacheable resources? [closed]

Keeping the answer within the wordpress realm, your best bet is to install W3TC and use that plugin to optimize your speed. Even with the default settings you’d already be gaining a lot. If you want to delve further you can keep tweaking the settings within the plugin. The next step to take would be setting up (with the help of the plugin) Cloudflare.

I would not worry about speed optimization outside of anything this plugin can do. The only exception to this rule: if you are on a VPS or dedicated server you can further speed it up by employing APC and Varnish.

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