Full tracing of CICS Transaction Gateway can degrade system performance and should not be used in a production environment.
Tracing the Client or the Gateway daemon reduces performance significantly. Client trace means all the components of the CICS® Transaction Gateway that go to the Client trace file. Where possible, try to measure response times, without using tracing, through the different parts of your system, to find where delays are happening. For example, you can measure response times at the user application, or through the facilities provided by CICS and WebSphere® Application Server.