Large Images folder - IIS Virtual Directory and Application Pool

I have a large images folder used for Upload and Download with approx. 1.5 TB for a web site.
My Website use AppPool_A.
For performance reasons, do I need to create different Virtual Directory and different Application Pool (AppPool_B) for Images folder. Assuming, if the number of users increase in upload/download images the memory & cpu utilization will be more and App Pool recycle happens more often. And other impact is if Website and Images are in same App Pool, the application performance slow.
Pls. suggest