Throttle dev.raid.speed_limit_max to 1000 during preseed for package installs

I'm trying to find a work-around for the following bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=838503 Package installs during imaging of a new Stretch host with a simple raid1 system disk takes ~2000 seconds. The packages installs on an equivalent Jessie install take ~300 seconds.

Re: Throttle dev.raid.speed_limit_max to 1000 during preseed for package installs

I wanted to follow up on this post for anyone who might be interested in a workaround for Bug#838503 (also mentioned in the bug thread here: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=838503 -- thanks to Steve McIntyre!). The key here is to use "partman/early_command" to load the