Even with my custom Sony IR remote, there is a mini delay if I want a button repeatedly pressed by holding it down. I see the same behavior with the HK remote on the C2.
I can press any button once, repeatedly and there are No delays with both remotes.
I've also tried the Bluetooth PS3 remote but that does not repeat button presses when you hold a button down, which is needed if you want to scroll through stuff. Response time is naturally, noticeable faster.
After using the superb, ultra responsive Mi Box's Bluetooth remote I can no longer use IR remotes.
So I bit the bullet and bought a Wireless Mini Keyboard MINIX A2 Lite Air Mouse remote and that is a really nice remote for big handed
blokes Gorrillas !!
There is still that Mini delay if you want a repeated button press. Must be an LE AMLogic thing. I see that elsewhere as well.