Hi dyl47,
For a new computer, it should take about 15 seconds to get to the desktop from when you turn on the computer. If it is taking 15 seconds to display your desktop after you sign in, then there may be a problem. Your SSD can transfer up to 550 Mb/sec even though your connection supports 6 Gb/s.
There is not enough information for us to properly identify any bottlenecks.
Yimman