The Cooling Quality result indicates this area of the part has a cooling time variance which is much greater than normal.
The Cooling Quality analysis calculates the entire time that is needed for all areas of the part to freeze completely, and plots variations from that time value. When the cooling time is much greater than normal, the result identifies areas that will require a much greater effort to cool properly than other areas of the part.
When the cooling time variant is greater than normal, it can also indicate that you have big thickness variations in your part and that you should consider moving the gate into thicker rather than thinner areas.