What is the UAT Environment SLA?
There should be no expectations on the UAT Environment.
Running Performance Test?
You can not run a Performance Test in the UAT Environment. The UAT Environment is a very small fraction of the Production Environment. It would be a waste of everyone's resources to do a Preformance Test using the UAT Environment.
What happens if someone decides to run a Performance Test?
Your IPs will be put on the blocklist.