@jacobwilliams , please see this. I was just about to suggest you the same re: 64-bit integer (and 64-bit real) with your timing measurements involving your use of system_clock when @tomohirodegawa made that post in the other thread.
It may not change the gist of your benchmarks you reported thus far all that much but it will be good to ensure your “instrumentation” for timing has no issues. On this, please note your current use of a default integer and real with system_clock will leave a nagging doubt with some folks, it will for me.