I added the following tweaks and the phone is unresponsive after the Google logo goes away.
Which one do you think is causing it?
ro.config.nocheckin=1
net.tcp.buffersize.default=4096,87380,256960,4096, 16384,256960
net.tcp.buffersize.wifi=4096,87380,256960,4096,163 84,256960...