You should really implement support for the If-Modified-Since header and if-none-match header.
Every* RSS client is going to send that header on refreshes and if you haven't posted something new since the date-time in the header, you can simply return a 304 not modified response (which is tiny).
You can get the best of all worlds with a short TTL on the CDN edge you will have low bandwidth utilization and fast updates.
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[ 4.2 ms ] story [ 24.0 ms ] threadEvery* RSS client is going to send that header on refreshes and if you haven't posted something new since the date-time in the header, you can simply return a 304 not modified response (which is tiny).
You can get the best of all worlds with a short TTL on the CDN edge you will have low bandwidth utilization and fast updates.
My site purges the cache for feeds on deploy.