Super PI by Kanada Laboratory in the University of Tokyo is the program for Microsoft Windows for runs from 16,000 to 33,550,000 digits. It can compute one million digits in 40 minutes, two million digits in 90 minutes and four million digits in 220 minutes on a Pentium 90 MHz. It computes a million pi digits in about 17.5 seconds on raspberry pi 4 in Gambit Scheme (57 So, 1MB total to calculate a million digits of pi. I wonder if there are a lot of temporary allocations that...