The acceptation-/test environment is running on the same server as the production environment. Is this a problem?

Pentests could affect the response time of the web server. During a pentest many requests are fired at the tested environment. If the acceptation-/test environment is operating on the same server as the production environment, the executed security tests could have an impact on the response time of the production environment.

If production and acceptance environments are running on the same server, this must be indicated so that the researchers will take into account the number of requests they are firing on the server.