The article emphasizes how a slow computer can be caused by insufficient RAM (Random Access Memory), which is crucial for smooth operation, especially when multitasking. It provides step-by-step instructions for users to check the amount of RAM their devices have, detailing the processes for Windows, Mac, and mobile devices. The importance of RAM capacity is underscored, with advice that while 4GB may suffice for basic tasks, users should consider upgrading to 8GB or more for heavier applications and better multitasking capabilities, particularly for resource-intensive tasks like gaming or modeling software.