works fine on underclocked units.
the slow nature in the way LSDJ responds in your underclocked gameboy is fine. underclocking slows down the processor speed, you are seeing/feeling it in the slow response.
if you slow it down enough, you can see the screen refreshing itself (pulsating sort of).
bear in mind, changing the clock speed is taking the gameboy out of its designed-for operating parameters. so a lot could go wrong i suppose, but i know for sure these carts work fine on underclocked gameboy, whether with a real crystal oscillator or with something like easyCLK.
the scrambled logo on start-up seems like a edge connector contact issue, most of the time a blocky logo comes from this. as cliche as it is, blow hard into the game slot and the cart's connector, and try again. thirty, forty times as its been said....