Sorry that last sentence wasn’t clear. The linked duplicates version renders faster and uses less memory (note the scene name in the bottom right corner of each image coupled with the render time + memory in upper left). I get similar results on CPU and GPU @spikeyxxx. I’m using 2.83 and I noticed you’re on 2.91 alpha.
Is there an explanation for this significant difference?
My only guess comes from what Lampel said about modifiers duplicating source geometry data to achieve their function. Linked duplicates don’t do that I suppose