I am currently running a WordPress MU site with three sites one being a directory. I plan on having over 100,000 directory listings (posts) on the multisite. I have upload somewhere around 8,000 posts when the website slowed way down and couldn't even load the front page. I tried using wp-cache but didn't help much.
I am on shard hostgator hosting and wondering if I need to upgrade to dedicated server for such capacity. Will it help to use wp super chache?
I have created 5 successful WordPress sites but never anything this large. Does anyone have an suggestions?