Variable (up to 30+ RPM, depending on model configuration).

The internet is full of generic "how-to" guides, but the OEM (Original Equipment Manufacturer) manual provides irreplaceable details:

The ITW Mima 4.4 Series features a robust turntable design capable of handling high-volume warehouse workloads. The original manufacturer specifications outlined in the manual include: Up to 4,000 lbs spinning load capacity.