Conditional region questions

I’m not sure if my concern is related to the topic but I want to have proper understanding on the application of Conditional Region in App Connect. In my experience, sometimes upon the application loads I can see the glimpse of the region that suppose to be hidden before it hidden based on condition set. Does it mean that the corresponding script doesn’t wait for the condition to complete before deciding to show or hide the region, but runs asynchronously. I thought conditional region should be hidden by default until the condition is met.