# xschem

Stefan Schippers

05/14/2022, 6:36 PM
@User the 2 minutes are mostly the time for ngspice to read the spice models, the inverter simulations takes just some milliseconds. To speed up ensure you have a
file into the directory where ngspice is working (usually ~/.xschem/simulations) with following content:
Copy code
set ngbehavior=hsa
set ng_nomodcheck
If you want to further speed up by 4x use this element to load only one corner:
Unfortunately ngspice spends considerable time loading unused process corners, something I don't really understand why, but we have to live with that.