Your computer should be able to run at normal speed while having multiple windows open. Some may be playing videos, downloading music or programs, or viewing documents. Most laptops being sold to students today have more than 2GHz of processing power. This is a pretty good baseline to draw when shopping for a laptop.
Simply put, a student’s laptop is his or her lifeline. You’ll be on your laptop several hours per day, whether you’re writing computer code, typing an essay, researching a topic, or just checking Facebook. A laptop needs to be able to handle all of these tasks-sometimes simultaneously-and still operate with reasonable speed.
That being said, an English or Philosophy major who uses Microsoft Word and Adobe Reader is going to put less stress on their computer than an engineer who uses MATLAB or a computer programmer who uses Java. If all you need out of a computer are relatively basic functions, processing power is of less concern to you. Based on your interests, try to figure out what the specific uses of your computer may be.