You have a good laptop for everyday usage however, it is not really meant for games especially if you are attempting to run games like minecraft at 4k (UHD) resolution. Lowering the resolution to 1080p should help increase performance. However, you need to realize that integrated graphics is rather weak compared to graphic chips found in gaming laptops.
Below is a video showing the performance of a HP laptop with an i7-6500u and the Intel HD 520 playing minecraft at 1080p.
https://www.youtube.com/watch?v=GU4y4r3nx0s
If you want to play games at 4k (UHD) resolution then you will need to buy a pretty expensive laptop like twice the cost of your Dell to get a GTX 1070 GPU. But that will not run all games at 4k resolution with high...