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[pygame] Numpy slower than Numeric

I make heavy use of Numeric in my sprite engine.
When I did the following, I was able to 'drop in' numpy as a replacement, but it took 3x longer to load my complex graphics! :-O

try:
    import numpy as Numeric
    Numeric.Int = Numeric.int
    Numeric.Float = Numeric.float
    Numeric.UInt8 = Numeric.unsignedinteger
except ImportError:
    import Numeric

I'm leaving numpy in as a fallback import only, now, because of the speed hit.