It's a victim of core memory changes akin to games like warnder and tnzs. Not entirely sure if it can be worked around like the others, but certain memory functions which few games use extensively are much slower than before.
If you use a version 0.142u4 or earlier, you'll get your expected speed back. Otherwise, use frameskip. Even my AthlonX2 get's 100% with frameskip.
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