I've updated everything to the newest versions, but I'm still getting errors.
I had this site hosted on a shared server, but since that started shutting down and causing errors, I sent it over to a VPS with 600MB minimum dedicated memory. It's still always maxed!
I know it's this particular site, because I was using next to nothing with a few other sites on my VPS, then as soon as I added it, it jumped to 600-700MB at all times.
I've checked out the plugins. I'm using wp e-commerce, which I cannot stop using. I've installed Plugin Performance Profiler and wp e-commerce is using almost all of the memory at 72%, and I only have a few more plugins installed (memory shows 35MB usage average on the P3 plugin details page).
The website is running much faster since it's getting it's own 600MB, but I can't afford this. I have installed W3 Total Cache, and that doesn't seem to help a ton (although maybe it's simply configured incorrectly). I tried WP super cache, but for some reason, that takes the sidebar away and stretches it across the entire screen, among many other errors it gives.
I'm about at my wit's end with why this particular site is both so much slower than all of the rest of my sites, as well as takes up 20 times more memory than the rest.
The website is http://www.kershawguy.com
I would love any suggestions that anyone would be able to give!