In order for you to play Old School RuneScape on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
macOS Big Sur
Processor (CPU):
2.8GHz dual-core Intel Core i5
Memory (RAM):
4 GB RAM
Graphics Card:
Intel Iris Graphics
Network:
Broadband Internet connection
Storage:
200 MB available space
In order to play Old School RuneScape on macOS with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
(Big Sur) MacOS 11 and higher
Processor (CPU):
M1 Chip
Memory (RAM):
8 GB RAM
Graphics Card:
AMD 5xxx+
Network:
Broadband Internet connection
Storage:
4 GB available space