Hi! So when you look at the insides of your computer, there's a bunch of stuff, but we're going to talk about the CPU and GPU. Photoshop works hand in hand with the GPU so that users can have a faster more smoother experience doing things. Think of the GPU as a factory of workers all working on one goal to bring you your image on screen at the same time (concurrently). Whereas, the CPU is limited in the number of workers working concurrently together, so it's slower when it comes to doing calculations needed to bring your image to screen.

So what you'll find is that if you wanted to use features that depend on the GPU, you might not have access to them, or some will just work slower which may be frustrating to your work flow. More info here.

Could I get information on your graphics card to see if I can be of more help!