It might be that - when trying to save a value to the email address field - validation works very slow. Or that the value is not even saved at all. If this is the case, it could be that email validation is to blame.
By default, the Loki Components library contains an email validation that uses a simple validation to check if the format of the email address is correct. However, there is also an optional Loki_EmailMxValidator
module that extends this validation by also looking up the MX records of the domain part of the email. If no MX records exist, validation fails.
This requires an outgoing DNS query to be made. In production, this should simply be allowed and therefore is probably not an issue. In a local environment, it might be that your environment does not allow these outgoing DNS queries. If so, you could disable MX validation with the following command:
bin/magento config:set loki_components/validators/enable_mx_validation_for_email 0
We recommend using the Loki_EmailMxValidator
module and enabling the MX validation in production.