OS: OS X
MAMP: 2.1.1 (but I know others have the problem as well)
If it takes forever (4-16 seconds) to refresh local webpages which you have setup with a virtualhost you need to do the following:
Add the IPV6 to your vhost address in your /etc/hosts file:
# my local development site 127.0.0.1 localdev.dev fe80::1%lo0 localdev.dev ::1 localdev.dev
Note: localdev.dev is the name of your vhost site!