code after every frame runs too often?

[robbertmijn]

When setting "Call custom Python code" to "after every frame" and then having it run

if frame % 25 == 0:
    print(frame)

I'm expecting it to print 0, 25, 50, 75, etc (every second or so).

However, it's printing: 0, 0, 0, 0, 0, 25, 25, 25, 25, 50, 50, 50, 50, etc

Each second it bursts 4 or 5 of these, making me think it runs this line 4-5 times during each frame, instead of after each frame. Is this a feature or a bug?