Late 2013 Macbook Pro Retina 13'' Wifi Issues

Yes the router has 4 Gigabit slots and the NAS can also provide Gigabit. (via Ethernet I have a transfer speed of 70MB/s between NAS & PC)

About the 2.4 & 5 GHz..The router can simultanesouly run both frequencies, but with 2.4GHz activated there is some packet loss

Testing network speed with file transfers is kind of spotty.

Without installing anything (though you need two machines on a network) you can use netcat to test some transfers as described in:

http://khmel.org/?p=228

Change the bs=1000M to bs=1048576000 on a mac, or lop off a couple zeros to get your answer faster, also your answer will be harder to read showing bytes/s.

EG on one machine I did (in two terminals):

nc -v -l -n 20000 >/dev/null

and:

dd if=/dev/zero bs=12485760 count=10 | nc -v -v -n 127.0.0.1 20000

to get (without using a real network, just the loop in the kernel) ~249MB/s

as: 10104857600 bytes transferred in 38.628004 secs (261594091 bytes/sec)

That's ~2090Mbps

If you like something a little more robust look at http://iperf.fr/again, you'll need two machines, not just a machine and NAS.

10.9.4 out!! Let's try to see if it fixed 😀

EUREKA

They have fixed what they said was not broken

8 months of dropout misery ends (:->

Can you be more specific? What was fixed how did you confirm that and what are the new wifi version numbers?

Update to 10.9.4 and see if your issues are resolved

Mine are

Still terrible 5Ghz / 802.11ac performance.

The screen capture shows the SMB2 transfer of a 2 GB file. Look at all the up and down, maxing out at ridiculous 15 MB/s.

Windows driver gives a smooth file transfer at 3x the speed.

Im giving up on this now, Apple wont fix this before i buy a new machine.

Did you check with Option-WiFi on the MenuBar? Are you getting reasonable values?

It sounds like your antenna may be disconnected:

There is nothing wrong with the antenna.

If there was a problem like this, how do you explain the excellent connection with the Windows driver? (Bootcamp)

No luck for me using 10.9.4

I installed it; rebooted; slept over night, and on wake up it does not connect to my 802.11n 5ghz router.

This behaves exactly as I previously described the no-wifi-on-wake issue does.

I have yet to try creating a new location or resetting the smc or pram. I will try those, and we'll see if it can maybe not regress afterwards as has been the case.

Other than that Johnniecache have you tried something more rigorous than file transfer, like with http://iperf.fr/ ?

Same here. I installed the update while in France while on holiday with some hope that I would reconnect instantly when I get home. Still get the wifi search taking a few minutes before it finds and connects to my home network. Frustrating and infuriating that these Apple 'geniuses' can't work out a simple and basic problem especially since this latest update was specifically to address this wifi issue. Hope they finally get it right with Yosemite but I am not going to bet on it.

The updated os has fixed my issue it seems, it is like magic every time I open computer wifi is there, am a happy cookie

For me it fixed: rMBP 13" late 2013

This is weird!

10.9.4 fixed my problem but after a couple of days it came back!

I tried to create a new location in my network settings but still no luck ...

Mine connects sometimes and sometimes it doesn't. Afraid to connect my bluetooth speakers which started the problems for me last time. Anyone with an instant wifi connection AND bluetooth connection working at the same time?