Modern format 1 packs support ultra-high-definition rendering up to 16384 × 16384 Ensure Consistency:

A resource pack in UMP is a collection of textures and color configurations that define how MIDI data is visualized. Standard UMP installations come with three sample packs, but the community has expanded this into an ecosystem of high-performance visuals.

To find the best resource packs for Ultralight MIDI Player (UMP)

...then an ultralight player with a top resource pack is the best decision you will make. You get the nostalgia of General MIDI, the clarity of modern samples, and the speed of a command line—all on a computer that could be twenty years old.