Unless you've got a 10,000 rpm spindle, I wouldn't worry. I have a 10" D1-6 adapter for my 10" Pratt Burnerd Super Precision 3-jaw chuck, and another one for the 400mm 4-jaw independent chuck. While the 4-jaw chuck has yet to be fitted onto the spindle, I've had the 10" 3-jaw scroll chuck up to the machine's maximum of 1800 rpm many times. No problems even when loading it with cut heavy enough to slow the 5hp spindle.
ER-40 Collet Chuck For My Lathe
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