It simplifies faces by merging, improving, deleting faces.
Sometimes in complex parts, it increases the PC performance.
I mostly use this command to optimize
Select Faces to move when “Select Face” highlighted in Face tab
Select “Motion type” to move. (Distance-Angle and Point to Point most used motion types)
You can change the radius of the blend faces on the model by using the “Resize Blend” command.
The center of the cylindrical face changes, after the command
Pattern Curve is used for patterning curve-curves in the sketch.
Note: If you have a selection problem change curve rule on top bar shown in the figure