If your computer takes a long time to start, it could be because it is opening a lot of programs at startup. It is possible to stop programs from being automatically opened as the computer starts to allow the computer to turn on quicker. Without these programs running automatically in the background, this could speed up your regular use as well!
In Macs go into system preferences then click on users & groups. From there click on your user and go to the login items tab. Here you will see the programs that open when the computer starts up and will be able to remove them from the login items list.
On Windows open the task manager, which can be done by pressing Ctrl+Shift+Esc. From there select the startup tab ( you may need to select “more details” first), which will allow you to change the programs you want to open at startup.