Typing in a lookup field blocked by network request

I have an issue with standard axelor forms and lookup fields (such as the Customer in the Sales Order form). Creating a new sales order and starting to type the customer name triggers and network request to lookup the customer after 3 keystrokes. Until the network request finishes and the results are displayed in the drop down, all keystrokes are lost. This is very annoying and slows down the user because he has to wait for the lookup to finish before hiting the next key.
This is not limited to the Customer field, all lookup fields behave the same. When working locally ( e.g. on a dev server) it is barely perceptible, but on a production cloud server where latencies are higher, it becomes almost unusabe (e.g. in production mere roundtrip of 72ms makes it extremely hard to work with).
This was not an issue with the previous (angular.js) web frontend.

(Axelor 8.4.7, SDK 7.4.3)