Erratic Airport performance under Snow Leopard

Hello,
I'm wondering if anyone else is seeing this issue.
I recently upgraded an iMac (fall 2007) from 10.5.8 to 10.6.2. Wireless networking performance became very erratic. I testing by pinging the router (a Netgear access point) continually and found many blocks of missed responses, from 1-5 in a group. My Macbook (fall 2006), also running 10.6.2 and sitting just a few feet away did not display a similar problem, although occasionally it shows a missed response.
After lots of testing (including rebooting the router), I reformatted the iMac's HD, made 1 large and 1 small partition, and restored my Time Machine backup of 10.5 to the large partition. I ran the same Ping test and over 1000 worked without a hitch.
I then installed 10.6 on the small partition and upgraded it to 10.6.2. I ran the Ping tests, and the dropouts returned.
I have to conclude that this is a bug in Snow Leopard and I will file it with Apple, however if anyone else is seeing a similar issue it would be good to report as well.
I have to admit that there must be something about the Ping action that I don't understand. It would seem that if the iMac reports dropped packets it must be the router that didn't respond. But here the problem is only on the iMac.
Thanks,
Jack

Thanks for offering to help. Here are the stats.
Dlink DIR-615, Hardware version C1, Firmware 3.11NA.
RSSI -46
Transmit Rate 130
These are the current figures. The connection is running fine right now!
I always get a good connection to the wireless hub, but I frequently get a message saying I am not connected to the Internet. AT THE SAME TIME my iPhone and my old laptop running Leopard get onto the Internet just fine over the same hub, as does a desktop PC I have on a wired connect into the router! AT&T checked the line several times and say my DSL connection is good, though I replaced the DSL modem recently just to be sure.
At times my connection over the wireless runs blisteringly fast. The problem comes and goes, but when it comes it can last for several hours.
My SL laptop runs fine on the wireless net at work, so the airport card seems okay. And there were no problems when I was on Leopard. Looks to me like there is some incompatibility with SL and the way the router talks to the Internet. But that's outside my area of knowledge.

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Message was edited by: orch5

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Message was edited by: Joseph Snodgrass

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