Landscape Grass Type slow loading times with scaled landscape

Hey everybody,
with our current project we found this issue with grass types & our landscapes which is quite annoying:
When you use a landscape with other scale then 100 * 100 the grass types in the material take forever to show up (they are slowly loading in the seqments of the landscape).

When you use a landscape with the default scale of 100 * 100 the grass is almost instantly there, where it will take around 20 seconds on a scaled landscape. There is no difference in the amount grass that is loading.
Do you know of any kind of workaround to use grass types also on scaled landscapes?

Thanks in advance!