A DNS lookup of one of the root servers doesn’t exactly take a long time, but it is quicker to check a local cache, so one thing we can do to improve performance is to suggest the mapping stays in local caches longer.
one way we can improve performance is to use gzip and have zipped content delivered from the server. Zipping and unzipping takes less time than sending everything unzipped over the network.
the page requested may no longer exist on the server and the server will send back a 404 (file not found) error
the file has been moved to a new location and requests are being redirected temporarily (302) or permanently (301).
If this is the case your browser needs to make another request for the file at the new location.
The response time of the server is usually not the main bottleneck in performance. If it is, you probably need a new host or a better hosting package with the same host. Still there are some things you can do to improve response times, such as removing unnecessary redirection.
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