Thanks for asking question! To elaborate on this in Paas an an app runs in an App Service plan this means an App Service plan defines
a set of compute resources for a web app to run. When you create an App Service plan in a certain region a set of compute resources is created for that plan in that region. Whatever apps you put into this App Service plan run on these compute resources as
defined by your App Service plan which defines: Region, Number and size of VM instances, Pricing tier (Free, Shared, Basic, Standard, Premium, PremiumV2, Isolated).
When you create an app in App Service and put it into an App Service plan and app runs, it runs on all the VM instances configured in the
App Service plan means if the plan is configured to run five VM instances, then all apps in the plan run on all five instances.
You may look for configuring for Autoscale as per your need. Here all apps in the App Service plan are scaled out together based on the autoscale
settings. You may refer to Scale instance count manually or automatically.
If I have understood your scenario right you are having Appservice
plan (Size : P2v2), in which 10 app service are there but only 2 appservice is consuming more memory and you
want to improve that 2 app's performance. This can be done by isolating the compute resources. You can do it by moving those 2 app into a separate App Service plan. For more information, see Move
an app to another App Service plan.
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