You can be pretty creative with a swing blade.
In this example we will be converting small rounds 6" - 10" to squares the most efficient way possible.
A special heavy bunk is built to cradle the round log and then roll it over to sit within a platform where it's easy to center the log ready for final sawing.
This idea requires only 4 vertical cuts. Each cut can be marked on your base cross skid for easy repetition.
The principle behind this is limiting raising and lowering by defining movements to only 4 points. The more you have to move the mill head the more time the process takes.
Position the small log into the small square notch.
Locate the vertical blade to the first marked position on your skid. Perform the cut.
Locate the vertical blade to the second marked position on your skid. Perform the cut.
Roll the log to the right 'wider notch' and center it between the edges.
Locate the vertical blade to the third marked position on your skid. Perform the cut.
Locate the vertical blade to the fourth marked position on your skid. Perform the cut.
Most timber will contain enough weight to hold it steady as the last two cuts are being performed. However, if you are dealing with shorter lengths or much lighter timber you can construct a simple steel weight that could hang at the center of each end to help hold the workpiece down while it's being cut.
Use heavy bunks so they can not be moved.