When I'm in a rush and I'm about to do something that requires carefulness, attention, and "normal speed" as you call it, I tell myself that, if my purpose is to get done with it as quickly as possible, I should deliberately slow down, because more often than not, botching up something and then fixing it takes significantly longer than doing it right at a normal speed.
I suppose it depends on the model of risk associated:
If I drop my keys this will take another 10 seconds.
if I cut my finger while chopping vegetables this whole process will take an extra minute.
where the whole task might be a minute; taking another minute to fix things up is a 100% time increase. Where a task that might not be rushed; something that takes an hour; an extra minute won't be as big a change. so not as bad a change? (but this is something of a different effect)
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