> I posted most of my code for review to

Good, this isn't the place for non-Maps code dumps.

> - Make a cron job that accesses the file every 5 minutes to keep the data
> fresh in memcache

Why, how often is your data updated?  How about changing your code to
create a new KML file only when the data is updated?

Bear in mind that when using KmlLayer to display KML, your KML (when
successfully read) will be cached at Google's servers for some hours.
If your data changes often, you will need to overcome that caching as
well.

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