Sales productivity refers to the ratio of work done to sales closed.
In a nutshell, it's all about the efficient allocation and effective use of available resources. This involves better planning so that a salesperson can spend less time on low-impact activities and more time on high-value sales calls.
Any actions that will reduce the time, cost, and effort needed to close a sale will increase sales productivity.
Sales performance measures how effective a sales team is, both individually and as a whole, in performing sales activities. As a result, it defines their ability to achieve their sales goals.