Does size matter? Bucket size, that is. Is there an advantage to keeping bucket size in multiples of 8 (e.g. 64, 128, 256) or can I use something else (100, 200, etc.) without slowing down?
Not sure about multiples of 8, I just use them out of habit/OCD.
I only reduce the bucket size from default if I am having memory problems. Smaller buckets engage less memory, but take longer to render.