Want to get faster? Well how often to you train the obliques? internal and external obliques work contralateral to one another in accelerating and decelerating force couple to provide speed and movement.
Often the obliques are only trained in one plane of movement or through a greater volume of tension, but the truth is that the obliques need to be trained through both high tension and high force exercise selection in multiple planes of movement.
If your squat is suffering then think to back off conventional lifting and adopt some plyometric or explosive work. If you can sprint this is an awesome way to increase strength of the obliques which in tern when returning to the squat bar will make you stronger.
Periodisation is key, the obliques are no exception.