Firefly bushes take too long to activate, even when just walking by

The firefly bush effect takes too long to activate for the player too see, even when just going past them at walking speed. The effect only becomes noticeable by the time the player has walked past them and no longer sees them. This results in the firefly bush not creating natural ambience it is supposed to while walking or running around.

Steps to reproduce:

1. find or create a patch of firefly bushes

2. stand away from the bushes and set the time to night

3. casually walk past the firefly bushes

4. look back

Observed result:

Majority of the fireflies only appear by the time you go past the bush and look back

Expected result:

fireflies create ambience as the player walks past them