ps | grep hangs intermittently

[Steven Penny]

I can run "ps | grep" and it will run smooth

    $ time ps | grep bash
         2312    1908    3252       2312  cons0   1000 21:20:11 /usr/bin/bash

    real    0m0.031s
    user    0m0.015s
    sys     0m0.030s

and then other times it will hang

    $ time ps | grep bash
         3144    1908       0       3144  pty0    1000   Dec 31 /usr/bin/bash
         1908       1    1908       1908  cons0   1000 21:20:04 /usr/bin/bash

    real    0m11.189s
    user    0m0.015s
    sys     0m0.015s

What is causing this?

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