We have recently built a small commerce site with only about 30 products with variations. We are currently using:
- WordPress 3.5.1
- WooCommerce plugin v2.0.4
- A child theme of WooThemes "Shelflife"
- PayPal Standard
- W3 Total Cache plugin (to help with speed)
- VPS DreamHost server
We had to move the site over to VPS. The site was so sluggish, it was though you were on the old dial-up modem. On VPS currently most of the activity is below 1GB. It alternates between being below 500MB and just below 1GB. And there have been 2 spikes since setup that went up to 1.5GB and 1.8GB.
We have installed a W3 Total Cache plugin that helped a little bit, but the site is still too slow.
We also wanted to use PayPal Advanced so we purchased "WooCommerce PayPal Payments Advanced Gateway" plugin, but that opened up a whole new can of worms, so we had to revert back to PayPal Standard. I will save this for another Topic.