Link aggregated between NAS and a switch: the Mac as a very slow access...

Hello,
in my Office we're working with Macs and PCs and all the data is on a NAS.
Here is our configuration:
NAS <-link1->Switch<-Link2->Macs or PC.
Macs are connected with AFP protocol (because SMB is very slow).
We want to use Link Aggregation between the NAS and the switch (with 802.3ad procotol) but when we do that all the Macs have a very slow access to the NAS. But all is OK with the PCs.
What can we do? Is there a problem with macOS X and link aggregation?
Thank you for your help.
Nicolas

Sorry, not sure what the question is exactly.
You must have an Xserve, or Ethernet cards capable of Jumbo Frames for one, I assume the Switch & NAS are capable?
Possible clues...
http://docs.info.apple.com/article.html?path=ServerAdmin/10.4/en/c3ha3.html
http://discussions.apple.com/thread.jspa?threadID=1715388&tstart=0
http://www.macnn.com/articles/04/06/21/link.aggregation.for.macs/
http://www.smallnetbuilder.com/content/view/30556/53/
http://www.afp548.com/forum/viewtopic.php?showtopic=8309

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