When I make 2D objects with polygon colliders on them I always change the shape that unity generates automatically because I think it has too many nodes and will impact the performance. In most cases, I cut node count by 50-70%.
For example, Unity automatically generated this:
and I changed it to this:
So I optimized the path from 73 to 26 nodes.
But is my work really necessary? Will this affect performance in any way if my scene will have about 300-400 such objects?