slow wifi after Lion Upgrade

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i have 2 mac machines;

macbook & late 2007 edition of imac. upgraded lion on both machines.
on macbook, broadband works fine, no issues but, on imac, extremely slow , many times, drops out.

have kept both machines @ same distance wifi router , still, same. also, tried use opendns or google dns , still, macbook works fine not, imac.

router airport extreme, think 2007 model.
network broadcasting mode 802b/g

anyhelp debug , resolve appreciated. thanks.
 



Forums Macs macOS Older OS X Versions Mac OS X Lion (10.7)


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