As I understand hyperthreading, this is not true: 

>Also, unless you take your hyperthreading off, with just one index you are
>searching with just one half of the CPU - so your desktop is actually using
>a 1.5GHz CPU for the search.

You still have the full speed of the processor available - the processor itself 
just keeps switching between different threads of execution.  Some people have 
noted that some (single threaded) applications will run 5-10% slower when 
hyperthreading is turned on - but that depends on the app.  It certainly won't 
be running at half speed.

Dan

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