Dear colleagues,
I kindly ask you to share your approach to Migration process.
The situation is following:
I have to upload 700 000 values of Individual Customers.
1. When I split the full list for 10 000 values only and try to migrate using standart approach with XML templates, it takes exactly 1h 30min
Previously I parallel flows for 030.
2. When I use the same data scope (10 000 values) but use the Workbench approach, using CSV templates it takes 1h 40min.
As can understand it is toooo much time to upload full data scope (700 000 values).
Question:
May be you know another way to migtare data faster?
As I know that there is another one way, using A2X, but I can't understand what is it and how it works.
May be somone knows is it faster the standart ways, may be someone used it?
Thank you in advance!
I'm sure that it's very important question for each of us 
BR,
Alexander