One of our customers with a relatively large number of customers and orders has some problems with creating orders in the administration. Here are a few suggestions:

The search for customers takes a very long time with several customers (More than 500k customers in the system). After selecting a customer, the grid seems to reload which may be superfluous?
You could take some pain here if the way to create an order via the customer module would select the customer directly, but here you have to search for the customer again, which makes no sense.

If a product is to be added to the order, it is hardly possible with somewhat longer product names with variants because the column is too small. This should generally be fixed, as it is the same component as for orders. This could be a good quick fix.