In message <Pine.SUN.3.91-941213.960628182046.29763A-100000@dust0.dur.ac.uk> you wrote:

>   Basically I ran the Flops20 program using the -DUNIX timing option, but 
> this only counts up the user time, so I added the system time too.  This 
> gives a performance of about half that of RiscOS, however I did notice
> using top that while running this program the CPU seems to spend half of 
> its time processing interrupts!

I noticed this too when running POVray, until the point at which it
crashed, (see previous message) :-(

I imagine this mass of interupts is something to do with the FPE
trapping the FP instructions, maybe?

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