Here are some videos about magic that facilitates order-picking. It is hopefully that you can identify more bottlenecks in order-pick process and generate some better ideas. Tell us what your viewpoints toward those videos and what you think about order-pick.
Any idea about warehousing problem addressing?
Any idea about inventory cost reducing?
Any idea about distribution process accelerating?

video:
https://www.youtube.com/watch?v=cieNyKSAig8&feature=emb_title

https://www.youtube.com/watch?v=LXYFNmRKuqg&feature=emb_title

https://www.youtube.com/watch?v=msSBgPByoIY&feature=emb_title

https://www.youtube.com/watch?v=Ox05Bks2Q3s&feature=emb_title

https://www.youtube.com/watch?v=ag1MT5oXbgw&feature=emb_title