What affects photoview render performance?

Now some light quality settings
-
Step 1:
For this picture:
Render quality: Good
Cone angle: 14
Brightness: 1
Soft edge:14
Light radius: 0
Shadow quality: 100
Fog distance: 100
Fog quality: 100
Render time: 1:00.7 min -
Step 2:
For this picture:
Render quality: Good
Cone angle: 14
Brightness: 1
Soft edge:7
Light radius: 0
Shadow quality: 100
Fog distance: 100
Fog quality: 100
Render time: 52.2 sec -
Step 3:
For this picture:
Render quality: Good
Cone angle: 14
Brightness: 1
Soft edge:0
Light radius: 0
Shadow quality: 100
Fog distance: 100
Fog quality: 100
Render time: 52.6 sec -
Step 4:
For this picture:
Render quality: Good
Cone angle: 14
Brightness: 1
Soft edge:14
Light radius: 0
Shadow quality: 100
Fog distance: 50
Fog quality: 100
Render time: 28.0 sec -
Step 5:
For this picture:
Render quality: Good
Cone angle: 14
Brightness: 1
Soft edge:14
Light radius: 0
Shadow quality: 100
Fog distance: 0
Fog quality: 100
Render time: 15.4 sec -
Step 6:
For this picture:
Render quality: Good
Cone angle: 14
Brightness: 1
Soft edge:14
Light radius: 0
Shadow quality: 100
Fog distance: 200
Fog quality: 100
Render time: 2:33.9 min -
Step 7:
Now you will notice the difference in time just for the fog quality and soft edge
-
Step 8:
For this picture:
Render quality: Good
Cone angle: 14
Brightness: 1
Soft edge:14
Light radius: 10
Shadow quality: 100
Fog distance: 100
Fog quality: 100
Render time: 14:08.2 min -
Step 9:
For this picture:
Render quality: Good
Cone angle: 14
Brightness: 1
Soft edge:14
Light radius: 10
Shadow quality: 50
Fog distance: 100
Fog quality: 100
Render time: 7:48.0 min -
Step 10:
For this picture:
Render quality: Good
Cone angle: 14
Brightness: 1
Soft edge:14
Light radius: 10
Shadow quality: 25
Fog distance: 100
Fog quality: 100
Render time: 4:19.5 min -
Step 11:
For this picture:
Render quality: Good
Cone angle: 14
Brightness: 1
Soft edge:14
Light radius: 10
Shadow quality: 0
Fog distance: 100
Fog quality: 100
Render time: 1:30.6 min -
Step 12:
For this picture:
Render quality: Good
Cone angle: 14
Brightness: 1
Soft edge:14
Light radius: 10
Shadow quality: 100
Fog distance: 100
Fog quality: 50
Render time: 6:42.2 min -
Step 13:
For this picture:
Render quality: Good
Cone angle: 14
Brightness: 1
Soft edge:14
Light radius: 10
Shadow quality: 100
Fog distance: 100
Fog quality: 25
Render time: 3:34.1 min -
Step 14:
For this picture:
Render quality: Good
Cone angle: 14
Brightness: 1
Soft edge:14
Light radius: 10
Shadow quality: 100
Fog distance: 100
Fog quality: 0
Render time: 1:28.5 min