Well, if it runs good after the 20 seconds of no service, it's all good...
I mean does it really bother you that much ?
If it runs fine after is turns on there is no problems at all...
A problem would be if it took like 2 minutes to start
HTC ONE X endeavorU
16GB Orange UK
Stock WWE 4.2.2 - Rooted
HTC Sense :
1.36 Unlocked S-ON
CMW Touch 22.214.171.124
Additional Devices: iPhone 5 running iOS 7.0.2