Aaron Mildenstein

I just did a Python 3.6.4 build using all 4 cores, and it handled beautifully.  You can see where it switches from a single core for the ./configure into all for cores for the make -j4 altinstall
 
Time CPU load %cpu %sys %usr %nice %io %irq CPU C.St. 21:41:30: 1200MHz 1.00 26% 8% 17% 0% 0% 0% 57.2°C 0/8 21:41:35: 1200MHz 1.24 27% 9% 17% 0% 0% 0% 56.4°C 0/8 21:41:40: 1200MHz 1.22 26% 8% 17% 0% 0% 0% 57.1°C 0/8 21:41:45: 1200MHz 1.21 26% 8% 17% 0% 0% 0% 57.2°C 0/8 21:41:50: 1200MHz 1.27 26% 8% 18% 0% 0% 0% 57.4°C 0/8 21:41:55: 1200MHz 1.25 26% 9% 17% 0% 0% 0% 57.6°C 0/8 21:42:00: 1200MHz 1.23 26% 8% 18% 0% 0% 0% 58.0°C 0/8 21:42:06: 1200MHz 1.21 27% 9% 17% 0% 0% 0% 57.1°C 0/8 21:42:11: 1200MHz 1.27 26% 7% 18% 0% 0% 0% 58.1°C 0/8 21:42:16: 1200MHz 1.25 26% 7% 18% 0% 0% 0% 57.7°C 0/8 21:42:21: 1200MHz 1.23 27% 11% 15% 0% 0% 0% 58.2°C 0/8 21:42:30: 1200MHz 1.45 98% 7% 91% 0% 0% 0% 66.2°C 1/8 21:42:40: 1008MHz 1.92 100% 3% 96% 0% 0% 0% 66.2°C 2/8 21:42:51: 1008MHz 2.53 100% 2% 97% 0% 0% 0% 67.2°C 2/8 21:43:00: 1008MHz 2.65 100% 2% 97% 0% 0% 0% 68.6°C 2/8 Time CPU load %cpu %sys %usr %nice %io %irq CPU C.St. 21:43:12: 1008MHz 2.93 100% 3% 96% 0% 0% 0% 69.0°C 2/8 21:43:23: 1008MHz 3.31 100% 2% 97% 0% 0% 0% 70.7°C 3/8 21:43:33: 960MHz 3.49 99% 3% 96% 0% 0% 0% 70.3°C 3/8 21:43:44: 1008MHz 3.64 99% 4% 95% 0% 0% 0% 70.3°C 2/8 21:43:54: 960MHz 3.77 100% 2% 97% 0% 0% 0% 67.0°C 3/8 21:44:05: 960MHz 3.88 100% 3% 96% 0% 0% 0% 68.4°C 2/8 21:44:17: 1008MHz 4.05 100% 3% 96% 0% 0% 0% 72.0°C 3/8 21:44:25: 960MHz 4.04 100% 3% 96% 0% 0% 0% 68.6°C 2/8 21:44:34: 960MHz 4.11 99% 2% 97% 0% 0% 0% 71.8°C 3/8 21:44:45: 960MHz 4.23 100% 3% 95% 0% 0% 0% 71.3°C 3/8 21:44:54: 960MHz 4.22 99% 4% 95% 0% 0% 0% 72.8°C 2/8 21:45:03: 960MHz 4.26 100% 3% 95% 0% 0% 0% 70.3°C 3/8 21:45:12: 960MHz 4.29 100% 4% 95% 0% 0% 0% 69.0°C 2/8 21:45:20: 960MHz 4.27 100% 4% 94% 0% 0% 0% 69.6°C 3/8 21:45:29: 960MHz 4.30 99% 3% 95% 0% 0% 0% 73.1°C 3/8 I am very happy with the performance.  It didn't overheat (though I do have a passive heatsink, and no fan), and it was fully cranked from 21:42:30 to 21:49:55, and still 50% busy until 21:51:02, and basically went idle at 21:54:32, with a reported CPU temperature of 59.7°C.  It was 50.2°C by 21:58:43.
 
Linux opz2 4.14.18-sunxi #24 SMP Fri Feb 9 16:24:32 CET 2018 armv7l armv7l armv7l GNU/Linux This is the 256M version that was prone to overheat with the legacy kernel.  No such problems with mainline.