VMware F5 plugin workflows slow to respond

Using: F5 plugin: 2.0.1, VMware Orchestrator 5.5.1, BigIP 11.5.1 (LTM)

F5 workflows take an excessive amount of time to complete (although they finally do). Attempting to remove unconnected LTM instances takes ~ 15 minutes. Showing of connected LTM instances takes ~ 5 minutes. Orchestrator interface is unresponsive until workflow completes.

1) Can I remove LTM instances by updating a config file on the Orchestrator (standalone) server? 2) Could the unconnected LTM instances be the cause of the interface hanging? No activity can take place in the Orchestrator interface until the job completes. 3) Logs are showing normal activity.