Weak GPU usage

I've realized that PP barely not use my GPU. I've checked my laptop config, and turned on the turbo mode.

And despite this,there is GPU usage from PP.

And it is really slow in the following (simple) use case:

- one lens (gray levels)

- one object with a clip mask

- a background.

When painting on the clip mask, PP is freezing a  couple of seconds between each key stroke.

I've a recent and decent laptop, 16Gb of mem (not huge but decent).

Do you have the same lack of GPU usage from PP ?