iacas is correct re: getting your arms down faster. You also need to get your shoulders rotating more around your spine angle in the downswing. In other words, the trail shoulder works down and out during the downswing. You have too much down and not enough out. This leads to attacking the ball too much from the inside and fat shots, pushes, & hooks.To work on this, you may need to feel like you are swinging "over the top."
Compare shoulder alignments and levels.