What are some causes of PC's underperforming?

PCs can underperform due to several factors, including insufficient RAM, which limits multitasking capabilities, and an outdated CPU that struggles with modern applications. Additionally, fragmented hard drives or failing storage devices can slow down data access times. Malware infections can also consume system resources, while overheating from inadequate cooling can throttle performance. Regular maintenance and upgrades can help mitigate these issues.