Only lift off fingers you have to
eg 3142 - no need to lift 1 at all - use an open for 4 - you could even shift up the neck into 2nd position for the last 2 notes.
Miss out intermediate notes - some tunes work quite well without all the twiddles-especially if your in a situation where someone is speeding up the tune and it becomes a bit of a race.
Practise runs up to a starter note ( or down)- a bit like grace notes - and everyone will think you can play fast.
Vary the bow tightness a bit - see what works best.
Learn a tune well enough to play without music - reading tends to slow you down
Join a barn dance band where you play the same tune many times - it a nicer way to practice.
Other than that - its the P word.
FloraG.