Talk:Filters 1.9 and before

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I'd really appreciate a bit on performance tweaks for filters from someone who really understands this. Clearly a badly written filter can burn resources. I've seen various tactics such as making the "cheapest" check possible at the start of the filter and also using static variables as a pseudo-cache. --Howard Miller 08:43, 30 March 2009 (UTC)

Howard, I expect you would do better to post in GDF first to get responses, which can then be distilled here.--Tim Hunt 09:25, 30 March 2009 (UTC)