When gaming, processors don't play that significant role as graphics cards and RAM until and unless you want to push Frames Per Second (FPS) very high. Most laptops have an integrated GPU (graphics processing unit), which means you need to upgrade the processor to upgrade the graphics. Many laptops have the processor soldered into the motherboard, and it isn't feasible to change the processor/motherboard due to the cost and technicalities involved. Sometimes, depending on the laptop model, you can add an external GPU, but it isn't feasible due to the cost and technicalities. Compared to processors with more cores, the Intel Core i3 may seem too weak, but it is noteworthy that all games aren't optimized to use multiple cores. Less demanding games can perform well within two cores. It must also be noted that the latest generations of i3 processors having quad-cores are equivalent to entry-level i5 processors. You can expect more than a reliable gaming performance. However, unlike a casual pastime gamer, if you are a hardcore gamer rooted in high-end games, it would be better to go for an optimized processor.