I have a
Samsung 970 EVO plus 500Gb. Read/Write speeds are ~3000Mb/s, so no complaints there. Tbh I never bothered with the boot time, which is 27 seconds from OC-picker to login. But then again my mid-2009 MBP (max spec 3.06Ghz

) boots faster than that..
result:
So trims took 18s, about half of what others posted for a 1TB Samsung 970-type drive - makes sense I guess
PS: I got the gigabit i211-port working with
@Shaneee 's modified 'AppleI2xx.kext' - works flawless so far, but have only tried for a few hours.