I have a problem with slow file transfers from & between 2 iMacs which I'm hoping you can help with.

  • iMac27 is a 2009 with 12Gb RAM & a 1Tb HDD running High Sierra 10.13.6
  • iMac24 is a 2007 with 4Gb RAM & a 500Gb SSD running El Capitan 10.11.6

Both the above are connected to a Sagem router by 2.4Ghz wifi. I have plugged a 32Gb USB stick into the back of the router to share files across the network, but transfering the files is very slow so I did some tests using the same file with the following results:

  • iMac27 to USB stick - 143.6Mb file takes 69 seconds = 16.6Mbps
  • iMac24 to USB stick - 143.6Mb file takes 73 seconds = 15.7Mbps
  • iMac27 to iMac24 - 143.6Mb file takes 153 seconds = 7.5Mbps

I have tried this before with a different ISP's router but had similar results so I don't think it's the router. Any idea what could be wrong and what I can do to improve things as I can't live with this level of data transfer. TIA

  • Maybe instead of using this method, you could use AirDrop, iCloud, DropBox, Thunderbolt. I think the best option would be to use Thunderbolt and boot the one with the files needing to be teansferred into Target Disk Mode. – Todd May 20 at 16:24
  • . @knobby is the USB required for network sharing ? doesnt Mac has its own network sharing methods ? – ankii May 20 at 16:28
  • @todd using the local network should provide much quicker transfer rates as the network adapters in each iMac are capable of 100Mbps+ and my router 300Mbps. My internet connection is only 40Mbps. – Knobby May 20 at 17:05
  • @ankii Mac does have it's own network sharing methods which is what I am having issues with. – Knobby May 20 at 17:07
  • @Knobby oh I had misread.. So both the Macs are connected via the router, not by a direct wired connection ? – ankii May 20 at 17:17

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