for preview renders you can crank your min shading rate all the way up to 6.0-8.0

it will wash out the textures but who cares, its a preview - you dont need pore detail.

attached are my usual preview render settings.

as for the post filter - dont even touch that #$@%.  all it does is increase rendertime and wash out detail - the same can be accomplished interactively with much more control and cleaner results in an image editor in seconds.