Here is the thing. Windows 8 is a slow operating system in general, due to the large amount of cosmetics in use, so don't expect too much. Could you also provide the Specs of the laptop? Ex. RAM, processor speed and brand, HDD size? It can help a lot. But, if I were you I would back up all my important files first before doing anything. It depends of different problems you are having, but if your laptop isn't that important, like it's not your main PC, you should try doing a "refresh" of windows 8. You can find videos on how to. Now my OS isn't windows 8, but I do know that windows 8 is not that great, so if you can update even to windows 8.1 or 10, then I would. Also just as Allan said you should describe your problem more.
Hope everything works out!