played on Mame 0.251, (US / Asia, set 1)

I conserved shots and jumped wherever possible to reduce lag, although I haven't measured how much that helps. Waterfall RNG on the boss panel was really fast, moved through the double tanks fairly quick, and the alien boss towards the end was decent.

Some time loss on shooting the wall cores late on the base stages. Improving that or being much more aggressive on the alien boss would save a bit.

This newer version of mame fixes the enemy shots going right during the base stages.

Timer starts on the frame your character appears and you have control, ends on destruction of the final boss.