It really does make a difference; it reminds you of what your laptop was like when you first got it in terms of speed. Many unscrupulous stores will try to sell you a new laptop saying your current model is “worn out” or some other lie…

You’re 100% right as when I faced the problem similarly like this heating my laptop and showed it to my friend, he instantly solved the problems by removing the dusts from CPU fan and some other places.