Yeah, fair enough. I remember having install issues with Lego Island on my parents various computers over the years when I was a kid anyway! I just wanted to check that it wasn't a known issue with a known fix.
FWIW I have tested Ramp mode by playing all the various activities at least once and I can't see any real performance loss on this hardware. The only issue is that with software emulation it can't do transparency - elements like bike wheels, visors, windscreens etc are just a checkerboard pattern of opaque and transparent 'X's rather than actually being translucent, but I guess that was just an advanced effect at the time that needed hardware acceleration. I will live with it for now though as it's pretty minor and absolutely playable.