I have an Api App on Azure that pulls data from an Azure SQL Server. I want to limit access to the Api App to specific IP Addresses. If I allow all traffic I see no problems with the Api App. When I add an "Allow" record in the Access restriction found under the networking protocol Azure correctly blocks all other traffic from accessing the site but also causes extreme slowness and high CPU usage when called from the "Allowed" IP Address. The lag/slowness/high cpu usage is so extreme it often crashes the application that is performing the API call. I've tried allowing 0.0.0.0/32 and the Azure SQL Gateways for my region (A list of IP addresses listed by Microsoft for outbound IP Address with Azure databases) as well thinking that the firewall/access restrictions could have inadvertently blocked legitimate SQL traffic but the problem persists. I would prefer not to go down the rabbit hole of setting up a vNet at this time as I'm not confident that would solve my problem.