Wifi download speed very slow comparing to ethernet

Hello!
I have very strange problem with internet connection in my iMac.
I have a linksys router and 6Mbps broadband (slow or not, it's Poland ).
I try to download the same file via wifi or cable (connected to linksys).
Transfer on cable: 600-800kBps, transfer on wifi 50-100kBps.
Why is that?
It's very strange because ma macbook pro connected via wifi to linksys downloads the same file with transfer as well 600-800kBps.
On iMac there is Leopard 10.5.5. Linksys was restarted many times. iMac - 24" inch model 2.8GHz.
Does anybody know any solution?
Thanks in advance
Christopher

hello anybody?
please

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I've seen many other threads on slow download speeds, however most of those were last summer/fall after people upgraded to Lion. I bought a new iMac with Lion preinstalled (last summer) and have not had issues with download speeds until that last month or two. I believe the issue started with the Feb 1, 2012 system upgrade to 10.7.3. The iMac started to intermittently drop the wifi network. At this point the download speeds were also significantly slower. There was a patch that more or less fixed the dropping issue, however the download speeds are still awful. It still occasionally drops the wifi network, but not as often as before.
I've tried a few things to troubleshoot.
1) I have a Macbook Pro with Snow Leopard and I'm able to download a 2GB file in about 25 minutes wirelessly. On the iMac it estimates over 2 hours but takes longer.
2) I checked the firmware on my Qwest Actiontec modem, and it's up to date.
3) when I plug my iMac directly into the modem with an ethernet cable it's able to download the 2GB file in about 25 minutes.
Thoughts on how to resolve this?
Thanks!

Hi
I am in exactly the same situation with the ASA 5510 running security plus license, version 8.0(5) 512 MB RAM
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I have been trying to download the App Store updates OS X Update 10.10.3 and OS X Yosemite Recovery Update to my iMac for the past several days. When opening the Mac App Store, I click on updates and they appear. However, when I select 'download' my download speed slows to the point of less than 1 MB per minute.
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Apple servers are overloaded. Instead of using App Store, use safari to download the updates manually from apple websites.
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I had the same issue and downloaded manually from this link. It took me about 30-40 minutes. I'm using a 5mb connection. Your 40mb connection should be faster.
As for the iOS updates, you will have to download them from your iOS devices, because there are no standalone updates for iOS. Alternatively after you update your Mac, use iTunes to download iOS updates by connecting your iOS devices with your Mac. That should be faster than downloading through your iOS devices.

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iMac <======>Time capsule (bridge mode) <=====> 10/100 ethernet switch <====> Comcast router/modem Arris TG862
Multiple iDevices are wirelessly connected to Time capsule because Arris TG862 couldn't handle more than 10 wireless devices without kicking them off.
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Wifi download speed very slow comparing to ethernet

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