Performance Reference 
Enforce response latency and reuse timings in later tests.
max_response_time 
Fail a test if it exceeds the threshold (ms):
toml
max_response_time = 200response_time_ms variable 
After each test, Catalyst sets response_time_ms which can be used in subsequent requests or logs:
toml
body = { "prev_ms" = "{{response_time_ms}}" }