While there is no single industry-standard term "Pslk" specifically for content delivery, your query likely refers to in the context of optimizing content delivery workflows, or it may be a typo for Plesk (a popular web hosting control panel) or PSL (Pakistan Super League) content delivery.
The total time it takes to finish a piece of content from start to end. Throughput: The number of items finished per unit of time. WIP: The total number of items currently being worked on. Pslk - Content Delivery
Below are guides for the most likely interpretations of your request: While there is no single industry-standard term "Pslk"