Clearing Geometry/Saving image

[stezza]

Rendering a region of 800 x 400px from the VFB with main image at 4K.
The render time for the region is 45 sec. the clearing geo or saving the png image take 1m 13sec!!

So for my 150 frames I need to wait 2 hours of that time for saving the images, this doesnt seem right.
Plenty of memory
Same for GPU/CPU

Using nvidia ai denoiser
The saved out images are:

render.001.png
render.bumpNormals.001.png (dont know why this get saved out)
render..effectsResult.001.png

Is this normal practice with denoiser?

[stezza]

update.
If I clear the render using the clear render button in the VFB first - then this solved it for me.
But I wanted the whole frame to save so wouldn't need to comp the render region on top, but rather have them as whole frames.
Would rather have the time back so comp it in....

[hermit.crab]

Does it happen in a particular scene? If yes, mind if you send it? Does it happen if you use another denoiser (f.e. V-Ray or Intel)? Does the slowdown occur on "Clearing geometry" or "Saving image"? Does it happen if you save locally?