Doing E4 without saves/loads is far more difficult that it has any business being. This can surely be brought down another 5 seconds or so with better movement, especially on M5, but I'm in no rush to redo this run. See YouTube video for more thorough description.

E4M1: 20.03 :)

E4M2: 18.09 :)

E4M9: 10.20 :)

E4M3: 8.74 :))

E4M4: 35.06 :)

E4M5: 27.29 :(

E4M6: 28.80 :|

E4M7: 12.11 :|

E4M8: 34.26 :)