Framerate gradually gets worse by attacking enemy portals

Steps to reproduce:

Perform attacks on enemy portals (XMPs and Ultra Strikes) which register damage of 1% or higher on resonators. Eventually, the scanner's framerate will slowly begin to degrade. This gets gradually worse as more attacks are performed over time, and never goes away on its own.

The issue manifests more quickly if I'm attacking several resonators in dense areas. I personally notice the framerate start to degrade after destroying 50 total resonators, and it gets worse from there.

Attacks which do not display damage numbers on the screen (i.e. weak XMP attacks, or using an Ultra Strike to destroy a mod) don't seem to cause this issue to occur.

The issue is temporarily fixed if I restart the scanner.

The "Native Refresh Rate" option has no effect whatsoever on this issue. The issue has been present since long before that was an option.

Device info:

Samsung Galaxy S9

Android 10

Ingress version 2.109.3