I have large amount (700+) domains in Plesk 11.5. Domain creation takes a long time in Plesk (about 4 minutes). What is the root cause?
The time for domain creation increases when number of subscriptions is increased. It depends on many factors, like size of IIS applicationhost.config file on Windows system, a lot of IIS handlers, server load and etc.
Service Team improved performance and optimization in Plesk 12 on Windows servers (request id #PPP-7965). Aditionally refer to "Performance Improvements" section in release notes for Plesk 12:.
Performance was improved in Plesk 12. Please consider upgrading your pre-12 installations to a newer version to speed up subscription creation.