[zylepe]

I generated the planet a few times in testing:

with z13 building merge (extra 14 CPU hours of processing):

  - $4.68 on Digital Ocean 128GB 16 CPU instance (4 hours @ $1.17/hr)

without z13 building merge:

  - $2.75 on AWS EC2 c5ad.16xlarge instance (1 hour @ $2.75/hr) 
  - $2.88 on Linode 128GB 50 dedicated CPU instance (2 hours @ $1.44/hr)

Unfortunately it costs $10 in egress bandwidth fees to get the result out of AWS ;-)

Edit: formatting