Having fun with RGBPanels. I temporarily built myself a 384x192 display with 9 scan row RGBPanels linked 3 levels wide and 3 rows run in parallel.
All running on an rPi4 with https://github.com/hzeller/rpi-rgb-led-matrix given that ESP32 or teensy can’t really do more than 128x64 on a single chip.
My refresh rate is just above 100Hz on an rPi4. Realistically you can’t run many more pixels than 64x384 or maybe 64x512 off a single chip, whatever your chip is, because of the limitations of RGBPanels and the required refresh to get something that doesn’t flicker to the eye (this one already flickers on camera unless you force a slow shutter)