Is the problem in the code or in the OLED screen?

[anon57585045]

@3delectro

when I compile the code, it is well within the limit (50% or so), although I don't know if that's a reliable value or if things change when running for real

Most OLED drivers allocate a (relatively) huge screen buffer at run time. That is not reported at compile time because it's dynamically allocated.