like a flash

quick quickly rapidly soon swift swiftly

apace chop-chop expeditiously flat-out fleetly full tilt hastily hurriedly in a flash in haste in nothing flat in short order like a shot like greased lightning like wildfire posthaste presto promptly pronto

slowly

slow

expeditiously hastily hurriedly immediately instantaneously instantly promptly rapidly speedily swiftly

apace chop-chop quick

briskly flat-out fleetly full tilt in a flash in haste in nothing flat in short order lickety-split like a bat out of hell like a shot pronto swift

eventually later slowly