Delay dependent on resolution?

Hi,

Changed resolution on RPi to 2K and photonic takes couple of sec to display slice.
Changed resolution to 4k with low framerate and photonic takes 5-8seconds to display slice.
Do you have an idea whether this could be fixed in photonic or that is reliant on Rpi performance?
I managed to remove delay at some point using weird gcode but the performace isnt repeatable.

Thanks

Fixed. Runs 4K without delay now