I bought a used laptop that still has windows 7 on it, can it be that Facebook or other apps run jerkily because there have been no updates for windows 7 for a long time?
No, that is probably not the reason.
The hardware of the laptop is probably very out of date or the current drivers for the system are missing. You should install them afterwards.
Make flat, reinstall Windows, alternatively make your laptop faster with https://www.chip.de/...45611.html. Which laptop do you have?
Run system cleanup and defragmentation, then restart could help.
Download ISO for W7
https://winfuture.de/...,3291.html
Convert it to Ultimate:
https://www.trojaner-board.de/100776-windows-7-iso-download.html
Install all updates and then turn off updates:
https://www.chip.de/...83747.html
Install all drivers
https://www.computerbild.de/...88940.html
and
