Some people -- like me -- find that when we start up our Dell laptop -- an Inspiron 14, in my case -- the fan races for a disquietingly long time. Checking Task Manager, we see that some Dell services are using up a lot of CPU cycles.
It turns out that Dell's software is creating a restore point, in case you need to repair the computer's state to an earlier one. This is a duplicate of what Windows does each time you install an update to Windows, but the Dell one apparently is more thorough and takes place more often, such as when I open the lid of the computer.
The solution is to turn off Dell's System Repair, like this:
1. Go to Control Panel | System and Security
2. Click on SupportAssist OS Recovery, a Dell-installed applet.
3. Click the Settings tab.
4. Disable System Repair.
Update: My laptop would get quite hot in the area to the left of the trackpad, which concerned me. This is the area the laptop has the solid state drive and the RAM. However, after turning off the System Repair option, I got a bonus benefit: that area no longer gets hot. I am guessing the non-stop read-write actions of Dell's System Repair were working the SSD hard -- just my guess.