Ever wonder how many websites are on the server where your shared hosting account lives? You might be surprised – it may be several hundred. Planet Maine does not overload our shared hosting.
Try this Reverse IP Domain Lookup tool see for yourself.
This matters because a server is (for the most part) a single computer in a rack somewhere. The more sites on it, the more requests, the more requests delivered the more processor bandwidth taken up, the s l o w e r your site performs.