The number of process instances that can be processed in parallel by the engine is limited to 1000 by default (Configuration > Process Governance > Infrastructure > Batch processing size). However, this number can be lower depending on the workflow design and the use of custom report scripts. The process instances have the RUNNING status. If the specified batch processing size is reached, the process instances started additionally have the QUEUED status. You can display them in Instances. This Cross-tenant setting applies to all tenants on this server. To change it, use ARIS Cloud Controller. For further information, refer to ARIS Cloud Controller (ACC) Command-line Tool manual.
Archive completed process instances regularly to avoid a large number of instances that can have a negative effect on runtime and start times in process administration and Process Governance.