To skip the 4th red spring in level 2's spring shaft, hold arrow-down after the 2nd spring and release arrow-down before the 3rd spring.

40,000 cycles in Dosbox 0.74-7 on Arch Linux, Jazz 1.3, SB 16 High-Quality for 486-33.

If somebody gets a close time, I'll re-time by frames and compare load times. Dosbox and Jazz are hard to force into consistent load times across machines.