Comparison of an Arduino's performance?
OK, so I just ran some really old benchmarks on a LightBlue Bean (AVR 328p Arduino at 16 MHz).  The Bean ran the Byte Sieve benchmark slightly slower than a VAX 11/780.  The Bean also ran some of my old floating point computations about 2X faster than the 11/750 (this VAX model has no FPU to be fair to the AVR).  That puts the Bean's math performance at somewhere around 70 kFLOPs (with few divides in the mix).  A DEC VAX is several times faster than vintage 8-bit personal computers, an IBM PC-XT being roughly 1/3 to 1/2 a VAX "MIP" in benchmark performance, with an Apple II being slower still.