A few comments about the density DRC rules ( probably applicable to others ) : • When there is an error, having the actual reached density would be helpful, both for global but also windowed check. Knowing if your 0.1% off or 10% off would be really helpful • Not computing the same things twice ... ATM both for windows and global density, it literally computes it and compare against the low limit ... then computes it again and compare against the high limit ... I'm sure for simple designs you don't notice but when each check for each layer takes 5 min, not doing unnecessary work would be very welcome.

Good idea, I will look into it!