Just to wrap this up: So here is what I did to solve my problem (data is added once a day, time to render the result page takes forever): The function which gets the data got appended by: cache.disk.clear() and cache.ram.clear() I used the unix crantab to call that function once a day via a curl command. the display function is called 1-2 minutes later and cached for 24 hours. I removed the datestring although it would make no diffrence, but its just unnessassary. It works like a charm now I got load times down from 30sekonds to about 5 (there are some graphics rendered from the data via matplotlib).
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