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The old one is much smoother on my laptop (first gen Intel HD Graphics) than the remake.

On my laptop it's smoother in Firefox than it is in Chrome and both are much better than Safari. It might be your browser ;-)

Nice! That one allows for under-water (diving) rather than just above water.

Well, actually it doesn't, at least on my computer. The diving mode is simply black here.

You can row right through the floating boxes.