games are running very slow. what can I do to fix this?

so first, not that it matters a ton i imagine, but my laptop is an MSI GP63 Leopard 8RE. (wasnt in the choose device section.) i am having troubles with running games. they will either lag a lot or they will run so slowly that i really cant even play them. this laptop is more than capable of running these games, has almost nothing on it memory/storage-wise. so im really confused on why it cant run games very well. i believe i solved this somehow way back when, but now having these problems again. any help is appreciated!