Some of the laptops which are used primarily for work related tasks are often designed around powerful yet very efficient hardware components. The components found within the cheap laptops for sale under 200 are often business grade and therefore will make use of some of the more specific capabilities of the operating system which runs the computer. By design the processors will have the ability to run not only more effectively in a relatively stable environment, but more efficiently as well.
In the past there were instances where even the most basic computing tasks would cause the system resources to remain at a high level of usage. This is not exactly being efficient when the system only needs a small portion of the resources available. The efficiency aspect of the cheap laptops for sale under 200 dollars may make the multitasking usage a much more responsive experience for the user, while at the same time taking advantage of the more efficient designs of the components which make up the laptop. This is true of desktops as well, but when the overall efficiency of the laptop is reliant upon the conservation of resources, especially when on battery power, then the end user typically sees a noticeable difference than what may have been witnessed many years ago.