Barry's "processing speed" must be very selective, otherwise his power would suck from his point of view. All those runs across the city would still seem to take hours to accomplish from his sped up perspective. That 600 mile run to Starling City? That would have seemed like weeks to him.
At some point he must be able to run on "autopilot" while allowing his conscious thought processes to run at normal human clock cycles.
At some point he must be able to run on "autopilot" while allowing his conscious thought processes to run at normal human clock cycles.