WL500W definitely does offer this feature with FW from my sign below.
it splits wire and radio streams, keeps radio clean from multicast, if the subscribers are all on wire. Nothing else.
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@wpte
Moving the WL500w around a bit vastly improved the situation :) I only get a small stutter every few minutes if any at all... I still might have a look at the channel, as I selected the one in use years ago.
@theMIROn
Thanks for the clarification. I misinterpreted the effect of "efficient multicast forwarding", I thought it implements something like IGMP snooping.
Therefore it is clear why I don't see this option on the WL500w: It is configured as Wifi-Client / Ethernet bridge and hence doesn't provide wifi-services for clients.