Models created with 2017 SP1 and inserted in drawings are definitely slower, much much slower. The assembly model would rebuild in like .04 seconds and it could take up to 40 - 60 secs in the drawing file. I use multiple drawing sheets and as soon as I got to a part drawing it was right up to speed, but as soon as I clicked on the Assembly Drawing it would crawl along. I think SP2 is a little better.
I can open up a much more complex assembly that was done pre-2017 and it opens and rebuilds fine....
I've used SW2017 sp's 0, 1, and 2, and haven't noticed any slowdown when working with Drawings.