Wireless Multicast Forwarding (WMF) is an efficient way to forward traffic on the wireless network. ... It is commonly enabled in situations when there only interested hosts need to receive a multicast. Enabling this feature is useful to improve wireless connectivity in your network.

Should I enable multicast on my router?

The benefit of higher multicast rate is to lower the amount of wireless collisions that your wifi data may have. The biggest effect is seen only when you run multiple media streaming devices or services at the same time. First off, the best setting for multicast rate for your router is usually the lowest amount.

Is multicast bad?

As you can imagine, this is a very bad thing. Many networks have melted down due to large multicast streams. For example, when sending computer operating system image files, a tremendous amount of data is sent to every device in the broadcast domain, every computer, router, printer, and so on.