Hammy
Enlightened
Yep that's how it is!Played my stock p-47 board today.
The very first stage I encountered slow down. Especially on boss.
At 12mhz it's much improved on the boss but _still_ a little slowdown.
Don't think going any higher speed will fix that as doubling the speed should be enough!
It's possible to test the speeds to some extent on mame with the "overclock" sliders, it gives a idea how performance improvement will be.