The GPU performance cost of Capsule Shadows is proportional to the number of capsules used, the number of characters, and the screen size that their shadow affects.
Using a Radeon 7870 at 1080p, for example:
GPU Cost with 10 Capsules
Time in milliseconds (ms)
A single character on screen
Each additional character on screen
This implementation is very efficient, since it computes shadowing at half resolution with a depth-aware upsample, while using screen tile culling to reduce the amount of shadowing
work to only happen where it is needed.