According to Scaled Agile Inc., “Flow Velocity is the number of completed work items (stories, features, capabilities, epics) over a period”.
Since value is realized at the completion, then the more number of completed work is better than less number of completed work over the same period.
After all, Lean is all about the continuous delivery of value at the least sustainable lead time.
So, be aware of your Flow Velocity by measuring it — measure the completion / delivery throughput — from the moment the work is initiated to the moment it is completed and delivered to the hands of the customer.
How can you increase the completion / delivery throughput?
Sometimes, interruptions to flow happen in the form of Delays, Bottlenecks, Non-Value-add steps, etc. These are wastefulness. Learn to see these wastes and address these by their removal. These wastes will slow down your Flow Velocity. Therefore, shorten the Lead Time to Delivery… by optimizing your System/Process (i.e., remove / eliminate wastefulness (Muda)) — this will help improve your Flow Velocity… increase your throughput… increase your Value to the marketplace.