Hello Abhishek,

Thank you for your review. We are sorry to hear about your experience. Below I have provided steps and a link that should resolve these issues.

Slow Performance Troubleshooting:
1. Restart your computer regularly
2. Run the automated tools provided in the SupportAssist tool
- Press and hold the Windows () key, and then press the q key.
- In the search box type supportassist.
- Select SupportAssist (Trusted Microsoft Store app) in the list of results.
Note: When SupportAssist does not show up in the search results, browse to the SupportAssist for PCs and tablets page for information about downloading and installing SupportAssist.
- Touch or click Start Now to run all the tests.
Note: You can touch or click the down arrow and then run the individual test, but for slow performance issues, we recommend running all the tests.
- SupportAssist runs the tests one by one and provides the results.
3. Run a complete hardware diagnostic test
- https://dell.to/37S183b
4. Scan your computer for malware
5. Restore your Dell computer using Windows System Restore
6. Reinstall Microsoft Windows
Full article: https://dell.to/3n54NzM

Wifi Troubleshooting: https://dell.to/3mvy0mB

For additional support, please call Dell directly at 1-800-624-9896

Best,
Lexy@Dell
Chat or Call:
https://bit.ly/DellSupportTeam