IBM® Informix® 12.10
Effect of configuration on CPU utilization
The combination of operating-system and Informix® configuration parameters can affect CPU utilization. You can change the settings of the Informix configuration parameters that directly affect CPU utilization, and you can adjust the settings for different types of workloads.
Multiple database server instances that run on the same host computer perform poorly when compared with a single database server instance that manages multiple databases. Multiple database server instances cannot balance their loads as effectively as a single database server. Avoid multiple residency for production environments in which performance is critical.