To get the best performance (boot time too) it's important to have the right ram for your motherboard.
When I built my Main PC, several years ago, I just put in one stick of 4GB ram. Some time later I acquired another stick of 4GB ram, but not from the same manufacturer.
The two sticks of mismatched ram seemed to work OK, but my reboot time was 101 Seconds.
Just last week, I got a single 8GB stick from Crucial.com. I removed the two mismatched sticks and installed the one 8GB stick. Now my reboot time is only 85 seconds.
That improvement in performance not only effects boot time, but everything I do on that PC.
So, for best performance, make sure you have the correct ram for your PC. Crucial.com is a good place to start. They use only the finest quality ram, from Micron.
Happy Holidays,
TM