>Set Assert off
>
>nStart = Seconds()
>For t=1 to 100000
> Assert .T.
>Endfor
>? Seconds() - nStart
>
>nStart = Seconds()
>For t=1 to 100000
>Endfor
>? Seconds() - nStart
>
>The loop with Assert takes between 40% and 50% longer than the loop without any command in there.

Of course, this doesn't say anything about code that uses ASSERTs, just that the ASSERT command itself takes time, even without ASSERTs ON. That's an important finding, but it shouldn't affect our coding practices (and I'm sure you agree).