The floating point version of Imagine uses inline floating point code for maximum speed. It does not use the libraries. I suspect that the non-FP version uses the libraries, just in case. You can probably SPEED UP your trace time SIGNIFICANTLY by scaling up the whole scene in the stage editor (see question 4 above!). A trace time of 4.5 hours on a 3000/25 definitely a "wee bit" on the high side for a scene as simple as you describe.
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