Yep, I ALWAYS avoid going through security at C. Flew out of DFW this morning. Wife tried correcting me when I told the driver to drop us off at A21, as our departure gate was C26. I told her we were going via A. I usually prefer D, but since our shuttle was entering through the north entrance, and included another passenger who was going to C, I opted for the first/closest best option, as we were slightly tight on time.

The DFW airport page even has the following message: Terminal C - TSA Checkpoints at Terminal C experience increased wait times during weekday hours of 6 to 8 a.m. Travelers may check in at Terminal A or D and ride Skylink to their gate.