Very slowly (as a snail is known to move very slowly). My research is moving at a snail's pace—every experiment I've tried so far has failed.We'll never get there on time with you driving at a snail's pace!
at a snail’s pace
and at a snail’s gallop
mod. very slowly. Poor old Willy is creeping at a snail’s gallop because his car has a flat tire. The building project is coming along at a snail’s pace.