What does the "Prs" mean on the top of screen?

[AC Question]

There is a bar on the top of screen that shows "P:0/1 | dX:0.0 |dY:0.0 |Xv:0.0 |Yv:0.0 |Prs:0.05 |Size:0.00".

What does the "Prs" mean?

 

[belodion]

Something to do with progressive frame rates per second?

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