how to solve this very big instance Leuven2.txt with 4000 customers.

[qtbgo]

Hello, I just wonder if jsprit can solve Leuven2 instance, which has 4000 customers.
see http://vrp.atd-lab.inf.puc-rio.br/index.php/en/
under Arnold, Gendreau and Sörensen (2017)

I adjust the format to Christofides format so that I can solve it using jsprit. The jsprit solving file and the instance are attached.
the best known solution is 111399, while my jsprit solves it around 130000 in an hour. I wonder if we can tweak jsprit to improve the solution.
leuven2.zip