You need to wait couple minutes.
Good luck with that.
Solidworks doesn't handle large patterns very well.
In the past, I've made a sketch pattern, and put the features in based on that. sometimes it's better. Sometimes not.
I've also ended up patterning a small portion of the part, and covering the rest with a note on the drawing.
show and dimension a blow-up of just that area, and add a note saying how many, and what the spacing is.
I have a similar problem, I believe I'm creating couple more hole but still the same.
I have a
just to name a few
If it's possible, try patterning some of the holes first, then pattern this pattern. Repeat several times to get what's needed.
if its not going to affect the outcome then try checking "geometry pattern" in the pattern settings, this reduces the processing requirements as it disregards end conditions for the patterned features and simply patterns the geometry, much less processor intensive and therefore much quicker to rebuild.