How to make my computer run like new on Windows 10

Given that your PC "used to run great" but has degraded over months, the problem is almost certainly accumulated junk files and background services.

Performance Monitor (perfmon) analyzes your entire system over a 60-second period and highlights exactly what's dragging down performance. Using Performance Monitor is one of the smartest ways to make my computer run like new without installing any third-party software, as it helps you identify exactly what's slowing your system down so you can fix the root cause rather than just treating the symptoms.

How to run it:

1. Press Windows + R on your keyboard

2. Type perfmon /report and press Enter

3. Wait 60 seconds while Windows collects data

4. Review the color-coded report (green = good, yellow = warning, red = critical)

Think of it as your computer's "doctor." When you want to make my computer run like new, because Performance Monitor is a powerful built-in Windows diagnostic tool that has been part of the operating system since 1993. Unlike Task Manager which gives you a quick snapshot, Performance Monitor provides detailed, real-time data about how your system resources—CPU, memory, disk, and network—are being used.