@Ryan R can you send the complete netlist causing the ngspice error? For speeding up netlist parsing there are 2 things to check: 1. ensure there is a

.spiceinit

file in the

simulations/

directory with following content:

set ngbehavior=hsa
set ng_nomodcheck 
# set filetype=ascii

2. use xschem symbol

sky130_fd_pr/corner.sym

, (instead of the usual

code.sym

block) which loads only one process corner instead of parsing all corners. This makes simulation startup significantly faster.