There's a wide range of methods available to troubleshoot and speed up your Windows PC.
Here are some steps to take that should, at the very least, temporarily speed up a slow computer:
Close running apps when you're done, and make sure they're not running in the notification tray (next to the volume and Wi-Fi indicators). because when you close some apps, such as Slack, they keep running in the background and consume resources.
Pause OneDrive syncing. This is something even Microsoft admits can slow down your computer. Pause OneDrive by clicking on the OneDrive icon in the notification tray, select More and then Pause syncing.
Check available storage space and hard drive health. If your computer's hard drive, or even an SSD, is running out of space, or is getting old, it could be cause issues without actually failing completely. If you aren't comfortable testing your hard drive, take your computer to a technician to diagnose any issues, and if required, upgrade your storage to an SSD if capacity / budget allows.
Turn off your computer. Don't just restart it, but power it off completely and walk away for a few minutes. This gives your computer a chance to clear out memory and it will be ready to start fresh the next time it's turned on.
This video is a bit on the long side but is one of the best in terms of being well made and relatively easy to follow [if you understand everything he is talked about] so that you can get your Windows 10 system tuned up.
There may be a few things that you are not used to, but as the presenter says you can just skip over any bits you don’t want, or need.
There is a particularly interesting bit near the end where he says he prefers using Linux at home [he has to use Windows at work] so if you tick the ‘like’ button under the video you will automatically be informed about new video posts he makes.
This video runs through a number of settings to help you optimise the setup of your Windows system - well worth a look in case there is something in it from which you can benefit.
The video is quite long [at 12 mins 19 seconds] but here is a breakdown, kindly provided by vlogger Techgumbo, that lets you jump straight into points of interest .....
TechGumbo also mentions "How to Enable Windows 10 Ultimate Performance Mode", if your kit is more powerful than average, which you can watch at this link [just 4 mins 42 seconds]