With the mechanical hdd mine boots in around 8 seconds. I haven't installed an ssd yet because I've been busy, and tbqh, the system is pretty quick on its own.
I have the G751JT-CH71 I installed an Intel (730) 480gb SSD as OS drive SATA. My WEI (windows index rating) improved (Score is: 8.1) and my Heaven Benchmark score improved ( Score 1451 Extreme Tess). The boot time is average 9.1 - 12.5 seconds (cold boot) (sometimes less) from sleep state its instant on or about 1 sec.