That’s horrible. That really shouldn’t happen, chrome is the most tested browser, with firefox a close second 
If your computer is running windows 8 it can’t be that old, it should have way more than enough power to run things unless either I’ve done something bad like added a memory leak somewhere, or there’s some third party reason for bad performance on your computer.
If you open up “System Information” on that computer, can you tell me what kind of CPU you have, and how much ram you have? You can access this by by typing msinfo32 in the ‘Search’ box in the start menu. (I think it’s also accessible in some way through the control panel somewhere, but I forget the specifics)