I was thinking the same. It took 30 minutes to ‘several hours’ to produce 23 megapixel renders, which are 100MB max. Either the renders were heavily paging mem

I was thinking the same. It took 30 minutes to ‘several hours’ to produce 23 megapixel renders, which are 100MB max. Either the renders were heavily paging memory to disk, or OP was working at the compositing phase.