Creating new patterns

[Gawdzira]

I just made my first stab at a new pattern. It was a nostalgia pattern for those that have ever cut out peel and stick dot matrix screens for poche. Just a grid of tiny dots. I placed small filled gray circles at 1" on a 12" square grid. Saved that to a pattern and I almost broke the internet. What is the better solution because that was a fail?

Thanks

Alan