Spell cascade area delay timings are not uniform.

Hello, due to spell cascade not working as I expected, I went ahead and tested spell cascade mechanics.

In the below screenshot I have gone frame by frame (@120fps) to measure the approximately delay in frames and noticed that the delay between the first and second areas are not the same as second and third areas.

"First->second" is about 15 frames (+-1 frame), and "Second->third" is about 7 frames (+-1 frame).

Specifically what was tested is curse application timings with a self cast curse and vixens. I have denoted each area from spell cascade in text and the frame shown is the first frame where you can see the third blue area.

The second blue and first green area appeared on the exact same frame. What was expected was that the second green area would appear on the same frame as the third blue area. But this is not the case. The second green area will appear ~7 frames later due to "First->second" area delay being ~twice of "Second->third" area delay.