I said that "900MB is not very large" and Stefan said "900MB is really huge"---it's a matter of perspective, mostly. Considering that the post is in the analog-design channel, 900MB is really huge for anything analog. It is the size of a moderately complex microcontroller, and strikes me as possible for some synthesized digital block done in sky130 that is the full size of the Caravel chip. I have been doing fill pattern generation which is pushing the Caravel chip final GDS file to something like 1.4 to 1.8GB.