I hadn't yet tried profiling the programme. I actually deleted it a few days ago. I'm going to try to get something new running, and I will report back. On a slightly less related track: Is there any way to use cassava so that I can have pure state and also yield CSV lines while my computation is running instead of everything at the end as would be with the State monad?

On 23 July 2013 22:13, Johan Tibell <johan.tibell@gmail.com> wrote:

On Tue, Jul 23, 2013 at 5:45 PM, Ben Gamari <bgamari.foss@gmail.com> wrote:
> Justin Paston-Cooper <paston.cooper@gmail.com> writes:
>
>> Dear All,
>>
>> Recently I have been doing a lot of CSV processing. I initially tried to
>> use the Data.Csv (cassava) library provided on Hackage, but I found this to
>> still be too slow for my needs. In the meantime I have reverted to hacking
>> something together in C, but I have been left wondering whether a tidy
>> solution might be possible to implement in Haskell.
>>
> Have you tried profiling your cassava implementation? In my experience
> I've found it's quite quick. If you have an example of a slow path I'm
> sure Johan (cc'd) would like to know about it.

I'm always interested in examples of code that is not running fast
enough. Send me a reproducible example (preferably as a bug on the
GitHub bug tracker) and I'll take a look.