I have been started playing with anzan recently in order to try to improve my numeric processing time at bit with practice.
I have quickly found that subvocalizing puts a severe limit on my ability to process. If I visualize rather than mentally speak the results basic addition time improves instantly and significantly (although it is going to take me some practice to stop saying the numbers in my head). Oddly I stopped subvocalizing the written word at an early age but apparently I have never done so with numbers.
On to the question... With speed memorization do you make an explicit effort not to vocalize when you are memorizing OR is this the verbal component necessary to creating the chain and limits the speed of memorization?