The Zombie: So what if my site is the size of the zombie hoard, it’s pretty.
Always a Zombie? No, if band width is sufficiently high some won’t notice
Severity: Varies. More severe on low bandwidth connections.
Why is it a Zombie: Average site visitors rarely wait for a page to load more than a second or two. If yours takes 5 or 6 seconds to load, it’s possible the user will have moved on before the site loads.
Cure the Zombie by: Speeding up your site. Compress images, reuse images, cache when possible, and reduce the number of server requests (More info on how to do this in An Introduction to Website Performance: How to Outrun the Zombie Hordes)