https://twitter.com/ScriptOnRoblox/status/701220629207453696
No idea how to upload that large of a file to here so I made a short twitter video. It does fragmenting in real time (the baseplate is one giant part that’s broken apart when needed), runs at 60fps, and doesn’t lag online.
No bodyforce/position instances or explosions were used 
I can never figure out the right algorithm to fragmentation.
Could you point me in the right directions?
What I do is take each axis of size and cut it in half, and place proportionately smaller parts in those corners. When a certain dimension of a part is significantly smaller than the largest one (like a line or a plane) I don’t cut those dimensions in half and make it even thinner, I just cut the large/largest dimension of size. A cube, though, for example, would be sliced into 8 equally sized smaller cubes all one eighth the volume of the original.