Speed problems when composing numbered tickets

[KopkeLu]

We're having speed problems when composing numbered tickets.
(Template attached- simple numbering script via imposition)
On the PC it takes:
Job started 14:06:09 - 1498565169.
Creator: FusionPro(TM) VDP Creator 9.3.36
...
Composing record #100000, input record 100000
Sheet #10000, record #10
Job ended 17:39:10 - 1498577950.
Total Job Time: 3h 33m 1s
On the Mac it takes only 7 minutes ...:
Job started 14:22:37 - 1498566157.
Creator: FusionPro(TM) VDP Creator 9.3.36
...
Composing record #100000, input record 100000
Sheet #10000, record #10
Job ended 14:30:04 - 1498566604.
Total Job Time: 7m 27s

Anyone has the same experience? Any ideas what is going on?

Windows 7
PC Dell Optiplex 7010 8core i7-3770
Acrobat Pro DC v2015.006.30094
FusionPro VDP Creator 9.3.36
MacOS X El Capitan
Imac Retina5k 27Inch Late 2015
4Ghz IntelCore i7
Acrobat Pro DC v2015.006.30172
FusionPro VDP Creator 9.3.36