Amazon EFN european fulfillment network so slow

I stock my inventory in sweden but also aim to sell in france and germany, delivering via the EFN, Amazon EFN european fulfillment network.

Delivery time for a small parcel from Sweden to France is often 15-20 days?

It is very hard to get sale with this!

How can it be so slow and so inefficient? Is is warehouse and shipping?

Most e-tailer ship a small parce within europe in 4-5 days.

Is it due to amazon waiting for full trucks to bump down in low speed to europe and just being cheap?

Isn't Amazon suppose to be world class logistics provider?