Permanent Object Grouping

I have created an object with a 1 x 1 x .25 square and a .25 x .25 cylinder hole. I then duplicated and grouped that item, subsequently duplicating and grouping it multiple times, to where i have a 48x96 grid of them (4608 of the original grouped item, 9216 items in total if you count the square and hole seperately)
This is understandably causing a lot of stress on my browser. Is there a way to make the whole thing a singular shape that is no longer ungroupable, so as to reduce some of the stress?

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