Copying Multiple Files = Slow

G'day,
I have a PowerMac G5 running 10.5.8, and Macbook Pro (2010) running 10.6.8.  They talk to each other via an Airport wifi connection.
If I copy more than 1 file at the same time between the two machines, it is slower than if I were to copy the files individually.
Is this a known issue?
Has this issue been fixed in 10.7.x?
cheers

Lots of variables involved, but here I'll test one 511.9 MB file compared to 8554 items equaling 492.6MB files using Airport between Mac Mini/1.42Ghz/512MB to AEBS to G5Quad/2.5GHz/10GB and back, using FW400 drives on both ends...
8554 items equaling 492.6MB... 14 min 50 secs (40 secs preparing to copy, started with 12 minutes remaining but half way through it said 22 mins remaining)
one 511.9 MB file... 8 min 18 secs (time remaining steadily decreased)
Copying back the other way...
8554 items equaling 492.6MB... 16 min 16 secs (5 secs preparing to copy, started with 9 minutes remaining but half way through it said 16 mins remaining)
one 511.9 MB file... 9 min 30 secs (time remaining steadily decreased)
You could tell when small files were being read & written by watching the Bytes/sec sent dropping to very small numbers.

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