You purchased a brand new computer; hyperthreaded i5 or i7 with a clock speed of 2.9 GHz quad-core, a whole 8 GB RAM, and 500 GB hard disk. In the initial months, your machine was incredibly fast (of course, as you expected). Opening 20 tabs of Mozilla Firefox browser simultaneously never interfered with the speed, and even the RAM and CPU hogging google chrome did not affect the efficiency of your computer.