Gmail Caching features - Using the Matched-Index.

Why to use caching.

Caching is very useful if your data store is getting very large, or if your CPU is a little slow. Caching has been tested to work very fast on a p2-450/64MB with a message store of over 20,000 messages.

Even if you don't have that many messages, it is nice to use caching because of the instant response you get from the server.

To use caching you really should read this short documentation carefully. By understanding how it works, you will find it very easy to use once you get the hang of it.