i would like to implement a custom cache for all the feeds in my site because the rss requests are very intensive and i have a big db load does anybody know a good action before running the rss query so i can cache it ? i'm using memcahed and all the feeds should be cached for 1 hour tx
WordPress already caches feeds to an extent, but for better caching install one of the caching plugins. E.g. W3 Total Cache has the option to cache RSS Feeds.