Netfilter Performance when using MAC filter

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Hello everyone.
I'm thinking about implementing iptables MAC Address filtering (-m mac
--mac-source xx:xx....) in my network.
*BUT* I have a big network, with ~ 4000 internal hosts/IPs that will
be filtered via MAC, and I'm not sure about the performance of this
filtering.
Is the speed/performance the same for Mac filtering and IP filtering?
Or the MAC filtering (because it's more complex maybe?) is slower and
add overhead in a huge network.
Thanks in advance for any help.

Best,

Babu
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