Ans- McAfee slow down pc well yes it does under some situations that you need to take care of - McAfee being an antivirus will cover up space from your computer’s memory and as antivirus takes up a heavy running time it might cause problems for the computer to work fast and response on time, apart from it when McAfee is in your computer’s system then sometimes due to automatic downloads from the enable setting your system maybe fill with unwanted updates or files. Another reason behind the slowdown of your PC might be if in the setting your auto-scan option is enabled, this will lead up to a system scan in your PC while you are working on your system, this will automatically reduce your speed of the system.