For now, we only invite you to disable the usage/request of the WHOIS record.
This action will let the script speed up because we only use the equivalent of nslookup and the HTTP status code to determine the status.
Warning
We use/request the WHOIS record in order to avoid a specific false positive case. Indeed, if we disable the usage/request all domains which are still registered but not assigned to a specific IP will be flagged as INACTIVE.
It's not a problem if you keep/use the database system because the domain will be retested over time. But please keep in mind that without the database system we do not guarantee an accurate result.