Demon sigils harder to open

When I work with spirits, I easily get into the TGS. Literally while I’m drawing the sigil, the flashing and lines disappear. However I notice every time I’m working with a demon spirit, it takes awhile. I must focus, concentrate, and chant Enns to open. Not saying that’s a bad thing, it’s good practice, but was wondering will that get better over time with more practice working with demons?