completion and caching

All,

I'm attempting to use vim's omni-complete feature (ctrl-N, ctrl-P),
and am finding - oddly enough - that it keeps on re-scanning the files
in order to get the correct symbols, rather than doing what I would
think would be the intelligent thing, namely caching the symbols it
does find, and then updating that cache dynamically as I type.

Is it possible to set it up so such a cache exists? I could see two
levels of cache - one, a universal cache, and two, a local cache that
is specific to the vim executable and populated each time the complete
function is invoked.

Thanks much for any help,

Ed

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