What is the problem?
I am confused about rpi4 support and performance, I would like to know if a raspberry pi 4 4GB can handle two printers and two webcams
What did you already try to solve it?
Did some research on rpi 4 performance
serial.log or output on terminal tab at a minimum, browser error console if UI issue ... no logs, no support!)
Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible)