loadm.exelator.com what is this?

Ran a test and seeing some strange things show up. Does anyone know what these are? Are they coming from the fact that I embed Youtube videos on the page?

https://pixel-a.basis.net/dmp/asyncPixelSync
https://loadm.exelator.com/load/?p=204&g=700&j=0&buid=54cc985c-4340-4caa-97cd-d667b933fac0

https://www.webpagetest.org/result/190910_5J_40f6e848d582ad18c7ca3321d49007ec/3/details/#waterfall_view_step1
[hr]
Found this thread that might be related:

https://www.webpagetest.org/forums/showthread.php?tid=15647&highlight=loadm.exelator.com