Shotcut is maxing out my 16GB RAM and freezing

[shotcut]

Then, I guess it simply does not work good on your computer for whatever reason. You can try the different options in Settings > Display Method. I am sorry I will be unable to help further.

Display Method

Here are some Shotcut Display Method Registry files for Windows. After you extract or open this zip file, there are 3 files: Shotcut use DirectX.reg Shotcut use OpenGL.reg Shotcut use Software GL.reg Double-click any of them to set the Shotcut registry setting for Display Method to the corresponding value. This is very helpful if Shotcut is unable to startup because you changed it to an incompatible mode, or the default mode is incompatible.