Daz Very different rendering times for scenes of comparable complexity

[lawfullame]

I work with a DAZ studio using very old and weak hardware. But the performance in many scenes using the Iray engine is satisfactory for me. And sometimes it happens to me that when I change the pose of a character a bit and the zoom and angle of the camera, the rendering takes significantly longer than the rendering of the original scene, even if no new objects have been added. And this sometimes applies even when I restart the DAZ studio to free up GPU memory before rendering the edited scene.
Any simple tricks to avoid such an increase in rendering time?

 

[Porcus Dev]

Maybe it's due to rendering the characters more closely, I've also noticed that the images I render from very close (just the face for example) take longer than if I render the whole body using a distant shot.