program than you! But the hardware is super powerful now, it may be just 0.0001 ms vs. 0.0004 ms. I can write 4x faster. And human brain haven't changed a lot, so it may be even 1 week vs. 1 month. Human Time ⋙ Computer Time
CPU is super slow, and even can't focus. RAM is tiny, programmer especially. Disk is losing bytes all the time. Nobody to complain. So we prefer to leave code alone.