M-x compile output sometimes delayed

[Dan Jacobson]

In makefile I have
z:
        set -x;until test $$((retrys++)) -gt 9; do sleep 4;done

I do M-x compile.  I see the output in fits and starts, not every 4
seconds.  Sometimes it comes out line by line, sometimes it takes me
hitting say even the Shift key to stimulate it into spitting out
output.  Odd, as my processor is 99% idle.
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