Which one do you use?
They do another one on a different chipset too; the EZSP one is the newer hotness, and so far unlike the older model, there's no firmware update to flash.
https://sonoff.tech/product/gateway-and-sensors/sonoff-zigbe...
As user cricalix points out, there's also a version with an EFR32MG21, I'm not sure how they compare nowadays, see discussion on GitHub: https://github.com/Koenkk/zigbee2mqtt/discussions/14261