It takes 330 seconds on a machine where the top OpenJDK version takes 5.75 secs and my .NET version takes 4.8 seconds. However it's just several lines of code and I used ChatGPT as a fun use case for how long it would take to have something working. It took around 5 mins. So if one needs to run this code only once Pandas would be a huge win considering development time. Interestingly the RAM usage was much more than 14 GB input file, probably 2-2.5x of that.

BTW asking ChatGPT to utilize all cores did not yield anything working in reasonable time.