If you are talking about it sticking when you are down shifting, stop down shifting into first. It is not good for the trans if you down shift to first. There is a large amount of torque in first gear, that is meant for you to accelerate not slow down.

With it sticking, you may need to adjust the clutch pedal to give it more hydralic flow or check the shifter cables.

Making it faster....I am guessing by your pic you have a OZ Rally.....the usual...intake, exhaust, headers, cams, tune.....basically mod the shit out it....or sell it and buy an EVO