local Xerox recomended to reinstall Core
did you get a reference number for the SPAR and could you post it here, please?
It is a formal raising of an issue with Xerox for problem resolution. I believe it stands for Software Problem Action Report.
I dont know, what it is SPAR?
Did you author a SPAR? A SPAR will bring more attention to your issue.
There are no pre-flight performance problems known within the 5.1.0.x releases. You could upgrade to the latest release 5.1.0.7. You could also contact Xerox support to look into the problem.
The SW level can be obtained by selecting the "About" selection on the bottom on the GUI display. Within the blue splash screen a Version number is displayed (e.g., 5.1.0.7).