Constant REFRESH_PAUSE 

const REFRESH_PAUSE: u32 = 60;

Frames a refresh waits, refreshing nothing and holding nothing back, once a frame refreshing one block comes out past the peak’s frame budget: the content alone fills the peak, as where NVENC runs past a peak it leaves its level for, and a refresh crawling a block a frame would hold the rest of the coarse blocks back for seconds, which NVENC holds at its coarsest quantizer through its QP map and deblocks frame after frame (the static parts of a 1080p scene 0.4 dB under the uncapped session’s after two seconds).