The performance issue you're experiencing in your computer could be due to the limitations of your CPU, which may not be powerful enough to handle the demanding requirements of certain games, such as PUBG. Overclocking your CPU could potentially improve its performance, but it also increases the risk of stability issues and potential damage to your system, as well as voiding your warranty. Before attempting to overclock your CPU, you should make sure your cooling solution is adequate and capable of handling the additional heat generated by overclocking. Additionally, you should research the process thoroughly, understand the risks involved, and follow recommended guidelines to ensure a safe and stable overclock.
Another option to consider is upgrading your CPU to a more powerful model that better matches the requirements of the games you want to play. You can also consider adding more system memory (RAM), upgrading your graphics card to a more powerful model, or both, to help improve overall system performance. Keep in mind that these upgrades may also require a more powerful power supply and a compatible motherboard. Before making any upgrades, make sure to research the compatibility of the components with your system and verify that they are within the requirements of your power supply.