Hi,
Your concern about the performance of your device can be due to the changes in its configuration and/or broken/corrupted system files. Based on the details that you've shared along with your previous posts on this thread, we'd recommend performing an in-place upgrade to overwrite the existing configuration with default operating system (OS) settings as well as to fix system conflicts on your device. To do this, we'd recommend performing the steps posted by Andre Da Costa on this link. As an additional reference, you can also check the post of PaulSey here.
Let us know how it goes after you've performed the steps.