Reducing chain slap?

[Shibby]

Some of the newer, more expensive derailleurs have adjustments to lessen chainslap. You might check to see if yours does.

What is the point of this adjustment? Why would you ever want to adjust for more chainslap? I'm being a bit silly, but since there is an adjustment, there must be a trade-off between chainslap and something else. Just curious what that "something else" is...

[jeffscott]

What is the point of this adjustment? Why would you ever want to adjust for more chainslap? I'm being a bit silly, but since there is an adjustment, there must be a trade-off between chainslap and something else. Just curious what that "something else" is...

They increase chain tension....and that increases drag on the way up the hill....

[guitarjohn21]

I don't know for Sram derailleur but on Shimano there are 2 positions for the spring and the factory position is the softest. It's a bit of a hassle to change but it is a good opportunity to clean and grease thoroughly your derailleur!

Any tips on how to do the spring adjustment?
Thanks!