GMod is a very popular game modification for the Half-Life 2 engine. However, many users have complained that the game runs slow on their computer. There are several reasons why this may be the case.
First, GMod requires a lot of RAM to run properly. If you don't have enough RAM, your computer will start to swap out data from memory to the hard drive, which will dramatically slow down performance. Second, the Half-Life 2 engine is not particularly efficient when it comes to rendering 3D graphics. This means that even if you have a fast CPU and plenty of RAM, GMod may still run slowly because your graphics card can't keep up with the demands of the game. Finally, GMod is a very complex game with a lot going on behind the scenes. This can tax even powerful computers, resulting in slowdown.
If you're experiencing slowdown in GMod, there are several things you can try to improve performance. First, make sure you have enough RAM - 4GB is generally considered the minimum for running GMod smoothly. Second, try lowering some of the graphic settings in-game to give your graphics card some breathing room. Third, close any other applications that might be running in the background and using up valuable resources (e-mail clients, web browsers, etc.). By following these tips, you should be able to get better performance out of GMod without having to upgrade your hardware.