The researchers used an aggressively truncated and shallow depth-first search model, which likely contributed to the C64's speed and efficiency. However, it did show that the C64's implementation was highly efficient, using only 15kB of the available 64kB memory and consisting of about 2,500 lines of 6502 assembly code. This code was executed by the 1 MHz 8-bit MOS 6510 CPU, which took approximately 4 minutes per data point, compared to roughly 800μs per data point on a modern laptop.