Pocket carry is, understandably, a compromise. I discuss this and other topics in detail in my article on pocket carry in the current issue of Concealed Carry Magazine.
Pocket carry has great advantages -- easy of carry, few clothing restrictions, very good concealment. It is not as fast as belt carry or IWB (if untucked). It is, in most cases, faster or as fast as other methods of deep concealment -- belly band, IWB tuckable, SmartCarry, Ankle holster, etc.
Plus -- pocket carry has the advantage of casual "ready" access as I like to call it. Pocket carry permits you to have a full firing grip, and be prepared to draw the weapon, while still maintaining a non-threatening posture—your hand in your pocket. By contrast, if you are reaching back under your shirt to your holster positioned at 4:00 – everyone knows what that means – and it can escalate the situation and destroy the element of surprise.
I am not sure you are going to find a faster method of carrying your R-9 unless its a belt holster or IWB with a loose cover garment.