Having changed all the IFERROR TO "=IF(XX="","",IF(XXX>XXX*(1-$B$11),1,0))", it was 2.30% slower than ISERROR.
Essentially, ISERROR faster than "No-Error formula" faster than IFERROR.
Intresting outcome.. Any thoughts??
(btw I have a i7 3770 with 8GB ram).
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