You are not the only person noticing a delay. Most users have a delay and have addressed it by adding a 0.1s delay to a button's Action List which converts the Button from a repeating IR command to a one-shot IR command that executes immediately.

However, for things like Fast Forward/Rewind where a code must be sent multiple times, the delay approach does not work well. Therefore, I worked with LowPro to post a solution for Sony Codes, the most common problematic area.