libmpv 32 bits: how to reduce memory usage?

[wbtcpip2]

i use libmpv in a 32bit win32 appplication so i have up to 3,7 GB memory available.
when playing multiple 4k or 8k videos the free memory goes down and the app crash, so i would like to resize the input on the fly to hd 1280x720. Do the use of -vf libplacebo=w=1280:h=720 will allow me to reduce memory usage? or do you have a better idea?
what are the best mpv parameters to reduce memory usage?

[kasper93]

--cache=no would be a start.