I've had three laptops. Each time I purchased one it was almost the same CPU and RAM as my Desktop. Every scene the Desktop did effortlessly the Laptop stuttered, froze and just couldn't work with. From what I've gathered over the years it has to do with the difference between Desktop and Laptop CPU (processors). It seems the Laptop processors are seriously hampered. I think what it comes down to is the Laptops' Bus spead. It's the difference of how much data is grabbed at a time to process. Basic comparison, if the Desktop PC was serving the data to and from its' processor through a garden hose the the Laptop would be serving it to through a straw. Even if the processors are the same speed the Desktop wins.

My brain is just a toy box filled with weird things