Slot port Rounding

[solar0987]

Is there a difference in slot ports that are rounded vs a L with a 45? Also how wide should the 45's be

[Triticum Agricolam]

Rouded ports should have better airflow, which is always a good thing. Whether or not it will make a noticeable difference depends on a lot of different factors.

[Joe X]

Here's how to do a 45 inside a L port:

The idea is to preserve the width of the port at the turn, worst case is making the 45 too big reducing port area at the turn.