Yes, I agree, stability does need to come first. At times the website completely times out, times it is pretty quick, and times it is fairly responsive. The only thing I can figure is that VG Chartz is getting DOS (denial of service) attacks from that knucklehead that figured out how to bypass (albeit temporarily) the ban feature.
DOS applications are out there and pretty easy to find. It could be him or any other person banned in the near or far past.
It could be technical issues with MySQL I suspect as well.
Regardless of the reasons, VGC needs to be able to handle the load when an outside website -- such as tech.co.uk -- references VGC sales data. For a few hours following that article, you know traffic is going to spike in a big way. If they come here and get a timeout, it discredits the site in a rather alarming way...