Augh! Normally I never subvocalize, but after reading this post I've started dong it uncontrollably and it's noticeably slowing down my reading speed. And my typing speed.

edit: well, not exactly never. I think I sometimes do it when I'm reading a challenging text while distracted/tired. It's usually a harbinger of the dreaded "same sentence over and over for 5 minutes", so I usually don't get far with subvocalizing. (Also, thankfully, it only took a few minutes of being distracted from this topic for the effect to go away. Whew.)

edit 2: even when this is in effect, I can still easily read while counting. I guess it's not really subvocalization after all.