Speed on the open market comes from the same three levers regardless of your reason for needing it: an accurate price from day one, clean presentation, and paperwork ready to go so a lawyer can move title through Information Services Corporation the moment conditions come off.
A lowball cash offer is attractive mainly because it feels certain, but a financed buyer backed by a mortgage pre-approval and a solid deposit is close to equally certain, and typically only a couple of weeks behind a cash close once the offer is accepted.
The tradeoff is rarely as stark as speed versus price once the listing is priced and prepared correctly. Get your hand-reviewed valuation from Joel Dyck.