Sure, the best way to pattern is with Feature Patterns, not
sketched patterns. Create one hole, then use the
Insert>Pattern/Mirror to make duplicates.
Also, how are you making the holes now? With an extruded cut or
with the hole wizard? If you aren't already, you should be using
the hole wizard. You can try and pattern the holes in that, too,
which should also be much quicker than a pattern of circular