Hello, laziness just gave me some headache now. Because some of my code was evaluated much later, well first the memory use exploded but also I got an error which was really difficult to understand because it manifested much later than I would intuitively expect (when I read the record field, not when I wrote it...). Now, if nothing else for space usage needs, I need to make this strict. At first I tried bang patterns on my record: {-# LANGUAGE BangPatterns #-} data TvShow = TvShow { channel :: Channel, title :: !T.Text, startTime :: !T.Text, summary :: !T.Text } deriving (Eq, Show) That did not help. Then I tried deepseq: instance NFData TvShow return $!! result That did not help. And here's the catch: doing BOTH helps... I mean I think I'll check it again because I find it hard to believe but right now it really seems it behaves like that... Is that possible? That I need to combine BOTH deepseq and bang patterns to actually get my code to evaluate when filling in the data? Or am I going crazy? Thank you! Emmanuel