3 Reasons RAM Won't Speed Up Your Boot Time
Boot time depends on your storage drive, not RAM The speed of your HDD or SSD determines how fast the OS loads into memory. RAM only helps once the system is running.
More RAM only helps if you were critically low If you had 4GB and constant swapping during boot, upgrading to 16GB might save a few seconds. But the drive is still the bottleneck.
An SSD upgrade gives real gains On a modern system with an SSD, going from 8GB to 16GB changes boot time by a second or two. For faster boots, get a faster SSD or enable fast startup.