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I'm running a brand new Asus RT-N16 with DD-WRT v24-sp2 (08/12/10) mega on it. Lately, I've seen slow transfer rates when moving files from my laptop to my server over wifi (laptop is using wifi, server is on lan). I'm currently transferring a 1.2GB file at speeds between 200kb/sec and 500kb/sec ... that's way too slow.

This is my first time running DD-WRT so I'm not sure what sort of information I can give (log files, command outputs, etc). If it matters, my laptop is running OSX and my server is Ubuntu.

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How fast was it before? What changed -- the Asus RT-N16? Does the laptop support 802.11n? Is the router configured for 802.11n with two channels? –  David Schwartz Jan 25 '13 at 4:13
@DavidSchwartz Everything changed: router and firmware. It used to be around 5-6mb/sec if I recall correctly. Yes, 802.11n is supported by my macbook. In DD-WRT my wireless network mode is set to 'mixed' on channel 6 (2.437 GHz) with a channel width of 20 MHz. –  MaxMackie Jan 25 '13 at 4:31
I noticed similar degradation in performance with TL-WR1043ND. I think that with all good features DDWRT brings in, it sacrifices one thing, performance. Stock firmware of my router delivers at least twice as fast wifi speeds than DDWRT was ever able to. It's either one or the other. Two pills. Your choice. –  Califf Feb 3 '13 at 16:39
As @DavidSchwartz intimated, using a channel width of 40 MHz could give you an increase in speed - similarly if its practical to drop mixed mode that could give you a performance boost as well. (I'm skeptical DD-WRT can't give maximum performance generally, and in the case of a WR1043ND which I have experience with), but It is conceivable its a driver issue for your particular device. –  davidgo Feb 16 '13 at 6:09
Also, it may pay to do some network analysis to see what channels are the quietest and shift to a quiter channel - or "Auto" if its available. –  davidgo Feb 16 '13 at 6:10
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On the App Store, there are a few free Wifi apps that might assist in troubleshooting... (I myself have purchased WiFi Explorer when it was on sale, some months ago, and find it helpful in debugging other folks' wifi networks). This one seems rather cool: Wifi Survey (free) I have a mini, so it's not much use to me, but I'd have paid big bucks for something like that a few years ago for work. Something that's not altogether obvious is a verbose mode when holding down the Option key, and clicking the WiFi icon in the menu bar. It will then report the PHY mode, Channel, BSSID, Security, RSSI and Transmit Rate, which is something many of the free WiFi apps on on the store do, though a free app called WiFi Signal will give channel recommendations, should it detect overlapping signals from a neighbour.

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