# Performance Flags
URL: https://docs.valsight.ai/performance-flags/
Description: Config Option  Setting  Effect  Recommendation for 8GB / 4 core VM
| Config Option                                                | Setting                                     | Effect                           | Recommendation for 8GB / 4 core VM                                |
| ------------------------------------------------------------ | ------------------------------------------- | -------------------------------- | ----------------------------------------------------------------- |
| conf/environment.sh  (copy from conf/environment.sh.default) | -Xms, -Xmx                                  | Initial and max heap size of JVM | 4 GB  (50% of available memory if Postgresql is on the same host) |
| System Config Page, Features                                 | cache.maxConfiguredCubes                    | Max simulation cubes in RAM      | 10000                                                             |
|                                                              | featureFlags.asyncQueryExecutorCorePoolSize | Max parallel simulations         | 4   (number of cores)                                             |