Hello everyone!

I have almost 3 yo GL552VW laptop, Republic of Gamers, and it's getting really slow.
For example, when I have 2 or 3 pages opened in Chrome- one page is freezing and getting pitch black, even if on other pages there are no videos and online games. It gets Chrome to reset each times. Also, I have hard time to run Photoshop, you cannot even imagine - it takes 5 minutes to open a simple picture!
I have reinstalled Chrome, did a total cleanup. What can you advise me? Do you know what the problem can be?
I would appreciate all your advises.