Based on other android phones I've used, like nexus 5, gs3, lg nitro HD, etc, the delay LG has set on the G3's power button does feel a bit longer, I'd say a second longer. Is it a big deal? definitely not, but to those who are accustomed to a faster response time and probably because they use the power button for certain things, then yes, the longer delay does feel too long. I personally would like the stock android delay, which I think is only 1 second.
Sent from my LG-D851 using XDA Free mobile app
Motorola Atrix 4G > Unlocked BL!! > GingerBlur 2.3.4 > Navalynt's Mod (v1.4) > Tenfar's CWM Recovery Mod > CM7
LG NITRO HD P930
>> Root via SuperOneClick v2.3.2
>> Bytecode64's CWM v.5.**
>> KernelPan!c's v0.3