My comment from October 12, 2017 on the Spigot thread:

I love that Spiders leave cobwebs behind when they die, but all caves in the world get extremely overloaded with cobwebs, making it impossible to even walk on them due to they not despawning underground. That is quite annoying to deal with.

Is it possible for us to have a config option to make the Spider's cobwebs despawn underground, just as they do on the surface? Thanks in advance!

From your response:

Hmm, if this isn't already configurable in the config (I think it should be?) then please add this suggestion to the github issue tracker.

The suggestion remains the same: implementing a configurable option to make underground spawned cobwebs temporary as well. Caves are getting almost entirely filled with cobwebs, especially near the spawn area where spiders sometimes spawn and die naturally a lot.

It would also be wonderful for us to be able to customize how long the web stays on the ground. Below is an idea of what the configuration could look like.

  Spiders:
    Bonus Underground Spawn Percent: 20
    Drop Web On Death (Surface): true
    Drop Web On Death (Underground): true
    Cobweb Duration on Surface (ticks): 200
    Cobweb Duration Underground (ticks): 300