new element - rendertime

[QuakeMarine1]

imagen you render an image overnight
next morning you see image is completed but rendertime 8 hour
you wonder why rendertime is that high since the scene is quite simple

wish:
an element like a "temperatur map" to show render time per bucket from green/blue/red
maybe per pixel insteat of bucket

[Dave_Wortley]

This sort of exist if you use the SampleRate Render Element, show where the most samples are... = most time spent.