I'm not knowledgeable on Python and Redis, but very likely you're doing something wrong with either of them. Parsing fixed-length fields should take no time at

I'm not knowledgeable on Python and Redis, but very likely you're doing something wrong with either of them. Parsing fixed-length fields should take no time at all, so the bulk of the time should be taken by reading the file and inserting the parsed data into the data store. Reading and writing a 150MB file from disk should take only a couple of seconds. So before bothering with another language, you should try to pinpoint where the problem is. Python has a profiler, use it. Also, you appear to be using multiple threads. That probably won't help you much since your task is IO-bound, so try making it single-threaded. If you cannot find the problem then I suggest asking for advice on StackOverflow (or CodeReview).