Andycadd wrote:
> I use a dual 2.4 Xeon Hyperthreading 400mhz FSB
> 
> SSE is 15% faster consistently
> 2 threads is 1-1/2% faster than 4
> 
> Is this normal?
> 
> Is there a circumstance when SSE is not faster?
> The output png files look identical and have the same size.
> 
> Is there a circumstance when 4 threads is faster than 2?
> The output png files look identical and have the same size.

How are you timing this? Are you looking at the CPU time or the elapsed time?

Be aware that Windows lies about CPU time used when hyperthreading is
enabled, and there's little we can do about it right now. It will typically
show something like double what it should show, provided all CPU's (real and
virtual) are used.

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