Hi, I'm Bernard. I'm happy to help!
Based on your inputs, it seems that there is an underlying issue why the PC performance is slow. In addition, can you please check the System logs on the PC so I can further examine the root cause of the issue?
To share the System logs, please follow the steps in the link below:
Press the Windows key + X, then select "Event Viewer"
Click the drop-down of "Windows logs"
Right-click System > click Filter Current logs > Check: Critical, Warning, and Error > Hit OK
On the right pane, click "Save Filtered Log File As..."
Save the System logs file to your desktop and share it by following the steps from the link:
Note: You can also use your preferred cloud storage to upload and share the logs.