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Tried transferring 4gb file yesterday and seems to be taking such a long time. Anyone knows the transfer speed?

It may help to say that I'm using last year's AirPort Extreme.

EDIT: Two years later, I wonder: what about in 802.11ac? If the laptops supports 802.11ac but the router does not, what will the speed be?

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It's not clear how the bandwidth of AirDrop is allocated or if the presence of a WiFi connection will change the throughput. Looks like it's time to test and watch the disk usage to indirectly measure the throughput :-) I'll post when I have some numbers. –  bmike Aug 1 '11 at 3:07
    
The speeds are so far limited by the write speed of the receiving hard drive. So it's really fast. Things slow down when you move out of range and other macs step in to assist in a mesh fashion to move the files. –  bmike Aug 11 '11 at 20:10
    
So is copying through AirDrop will be as fast as say copying through external hard drive on FireWire/USB? –  Enrico Susatyo Aug 12 '11 at 13:48
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4 Answers 4

up vote 12 down vote accepted

AirDrop works outside of whatever WiFi networks are around and doesn't need a base station. It is like a mesh network where all the devices just talk between each other. If nothing else is "sharing" the road - you get the full speed. The further away you are or the more interference, the slower it gets. AirDrop will work by passing the data from Mac to Mac so it will get the file there (although slower) if it has to jump once or twice along the way.

That being said, for two close machines, the transfer speed should be the max wireless speed between your two machines. Hard drives are almost always faster reading and writing than WiFi speeds, so the radio link is generally the slowest.

However, all of that is just theoretical. You can check your actual speed by opening Applications > Utilities > Activity Monitor

Click the Network tab on the bottom and you should see stats about how fast the data is being sent and received. Detach from WiFi base stations to let AirDrop get all the hardware if you want the fastest transfers - leave it on if you need internet while dropping that large file.

Network Statistics in Activity Monitor

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Have you tried this with AirDrop on, but no WiFi joined? A netstat would be interesting in that case to see how the mac OS sees the airdrop connection on the network stack. –  bmike Aug 1 '11 at 3:08
    
What do you want to see from the Netstat report? I can post a gist if you are interested. –  Nate Bird Aug 1 '11 at 11:54
    
can you post the data received/sent /sec? Will this be affected if I measure it while browsing the internet or doing other tasks? –  Enrico Susatyo Aug 1 '11 at 14:39
    
AirDrop will only use a peer-to-peer connection, if you are connected to an access point it can slow the transfer dramatically. The best way is to run an ethernet cable between the 2 devices. Doing this I can get a transfer speed of ~12MBps. –  Raymond Jun 5 '13 at 1:09
    
A gigabyte network interface has a bandwidth of around 100 megabytes per second. Hence for non-SSD drives the bottleneck is the disk (and file system overhead). –  Thorbjørn Ravn Andersen Aug 5 '13 at 21:46
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I have been noticing varying speeds between my laptops (Macbook Pro 13' 2010 and Macbook Pro 13' 2011). Sometimes the speed is quite fast, and sometimes it is awfully slow.

I suspect that if the two computer are connected on the same wireless network, the speed is slow (as the files travel through my contemptible router).

On the other hand, if the Macbooks Pro are not connected on the same network, the transfer seems to be way faster.

I have not thoroughly tested this so we would need confirmation.

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Just tested the theory of faster AirDrop speeds between computers in different networks and it is true. The difference in speeds were from 1MB/s to approx. 5MB/s. So 500% increase. I saw a transfer of 8.58 GB go from an expected 2,5 hours to about 33 minutes.

When you transfer files be on different networks or on none at all.

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A trick for disconnecting from a network: biasedbit.com/speed-up-airdrop -- summary: run /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resourc‌​es/airport -z –  Ken Arnold May 26 '13 at 17:38
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I just tested with a friend's MacBook Pro and mine. Found it to be around 30x faster. If you connect to the network, it sends data through the router. So disconnect both computers from all networks and see for yourself.

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Thanks rsanchezsaez –  Nick Sep 20 '13 at 13:12
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