I’m not gonna say no since I didn’t try it, but I’m not sure we can get a lot from concurrency here since there’s not a lot of processing on each element, so I think the cost of message passing would shadow any possible benefit of concurrency.
But to be honest, I’m fairly pleased with results. On my machine I can read, filter, and write ~500k rows of CSV in about 1 sec, using about 64kb of memory. That seems decent to me 
