but it doesn't seems to correct the continuity issues

At least the "first step" PR keeps both continuous and discrete models in the repository, so people can continue to do comparisons and figure out what, exactly, is the benefit being conferred by the continuous models (other than not taking 30 minutes to load into ngspice if you forget to apply the right setup).

what the magic setup to make the other model load faster? :)

Copy the

spinit

file that is in, e.g.,

$PDK_ROOT/sky130A/libs.tech/ngspice/spinit

to the directory where ngspice is being run, and rename it to

.spiceinit

(or make a symbolic link).