With some laptops there is the problem that a program cannot always recognize the main dedicated GPU, and it will go with the low performance Intel Grafics instead.
In Windows 10 you can right-click on the app (sh5.exe) to make it start with your main GPU, on older Windows versions this is far more complicated, I have no idea how to do it, but you must make sure SH5 starts with your main GPU.
Cheers and welcome to Subsim,
XS