Performance
The performance of individual components, including CICS® Transaction Gateway, can affect overall system performance.
You can find more information about CICS TG
performance in the 
CICS Transaction
Gateway Performance Reports.
- Performance indicators and factors
The performance of CICS Transaction Gateway can be measured to understand the factors that affect performance, and to use the information provided to optimize that performance. - Memory setting on IBM z/OS
The memory requirements vary based on environmental factors or the characteristics of the workload. - Tuning the Gateway
You can tune the performance of your system by modifying values such as the number of connection manager threads and worker threads. Other values can also be modified to improve performance. - Tuning the Gateway to avoid out-of-memory conditions
The CICS Transaction Gateway statistics provide information to help you avoid out-of-memory conditions. - Tuning the JVM
Performance considerations related to Java include the size of the Java heap, whether JIT (Just In Time compiler) is enabled, and whether client applications are using persistent connections. - Tuning JEE
Because of the overheads associated with XA transactions, the use of network and processor resources is higher when using the XA transactional support provided by cicseci.rar with the xasupport custom connection factory property set to on. - Configuring IBM z/OS parameters
IBM® z/OS® configuration parameters needed to run CICS Transaction Gateway - EXCI considerations
For EXCI workloads, CICS Transaction Gateway and CICS must be configured to ensure there is not an EXCI pipe shortage. - IPIC considerations
When running the Gateway daemon under load and using IPIC connected servers, you might need to increase the size of the JVM heap for the Gateway daemon if performance problems are encountered. - Client applications
The parameters you set for your application can affect performance. - Tracing
Full tracing of CICS Transaction Gateway can degrade system performance and should not be used in a production environment. - Performance monitoring tools
The performance monitoring tools provide a way of measuring system performance characteristics such as transaction throughput and processor usage. - Statistics and performance assessment
Use statistics to assess system performance and to identify and resolve performance problems.
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Last updated: Thursday, 2 March 2017https://ut-ilnx-r4.hursley.ibm.com/tgzos_latest/help/topic/com.ibm.cics.tg.zos.doc//performance/topics/ccl99cc.html