sox runs slowly, uses 89% CPU

[boatman9]

Using the command "rec new-file.wav" (as shown in the sox man page) I recorded for 1 minute but the resulting file captured only 16 seconds of audio. During recording the top utility showed sox using 89% CPU. For this test I am using a 64-bit version of Mandriva 2010.2 on a 64-bit single core laptop computer.

 

Over on my 32-bit desktop computer, running a 32-bit version of Mandriva 2010.2, the command "rec new-file.wav" works fine. Recording for 1 minute produces 1 minute of recorded audio, and sox doesn't use a significant amount of CPU time.

 

What could be the problem with sox on my laptop?