PerfMon

There is no shortage of apps that can help you monitor resource usage, from complex, module-based solutions to simple utilities that run in the system tray.

PerfMon falls into the latter category, providing you with a straightforward way to keep track of CPU, memory and disk usage, via a simple system tray icon. It offers no advanced features or customization options, but it is lightweight and exceedingly easy to deploy.

One of the app's most notable benefits is the fact that you can run it as soon as it is downloaded without going through a setup process. It stores no data anywhere on your PC, and you can even launch it from portable storage devices.

The program’s lightweight design is well-suited for users who like to keep things simple, as you can just run it without having to worry about configuring anything. As expected, its resource impact is also negligible.

PerfMon creates a tray icon that consists of three vertical bars, which indicate CPU, RAM and disk usage; they are shown in red, blue and green, making them easy to tell apart. By hovering the mouse cursor over the tray icon, you can view the exact numbers in a tooltip.

It is worth noting that you cannot customize anything about the app’s functionality and looks, such as the parameters that should be monitored, the color of the bars or the icon’s background; users may not see these as drawbacks, but they should be taken into consideration.

In a nutshell, PerfMon is a great utility for users who need a straightforward method of monitoring CPU, RAM and disk usage. It requires no installation or configurations, and it does its job very well, but some users may dislike the complete lack of customization options.