Ok so earlier today I did the restart test 5 times, and assuming my computer didn't give me an OC error, the average restart time was 27 seconds with MBR + 1024 Alignment.
I just did it 5 times in a row with GPT + 4096 Alignment:
1. 30 sec
2. 30 sec
3. 30 sec
4. 30 sec
5. 30 sec
I'm pretty surprised there was literally no fluctuation in times, it might be 3 seconds longer to reboot BUT the other advantages in my case make it worth it. Faster write speeds and faster 4k-64Thrd read time. I'll take it!
you will drop 3 sec at least.