Slow Network Speed with MacPro

I just received 4 MacPro's with the dual quad processors. I have configured 3 for our workplace and have moved them into production. We are experiencing very slow network speeds, a test file on our server of 100mb takes 2 minutes 20 seconds to copy to the desktop. I have manually set the ethernet port to 100baseT with full duplo. The old machine is running the same OS 10.4.10, and only takes 12 seconds to copy the file. I should mention that we use DAVE to connect to our servers, both machines are running the same version of DAVE, and using a third machine I connected to both drops and the file copied in 12 sec, showing that the network is physically OK. The only difference between the two machines is that one is the intel version? Can anyone offer any thing to try?
Thanks
Message was edited by: Mark Crane
Message was edited by: Mark Crane

I am 99% sure someone else had 'slow transfer' in another thread.
Sometimes a router needs firmware update to be compatible, or upgrade the cables to cat6e, or look for a new router or switch which helped my own setup. Just look for one that says that it is "Vista compatible" actually.
http://www.thursby.com/products/dave-vs-tiger.html

Similar Messages

Slow Network Speed with Dell T5400 / BCM95754?

Hi,
I'm attempting to install ArchLinux on a Dell T5400 workstation.
The network card on this is a Broadcom BCM95754, I believe:
...eth0: Tigon3 [partno(BCM95754) rev b002] (PCI Express) MAC Address...
I've booted the installer, and when it gets to retrieving the package lists, it seems to time out and fail.
When I do pings from the VT, it seems to wait 2-3 seconds before printing each line.
When I try to use "links", it takes around 15 seconds to bring up www.google.com.
I check ifconfig, and it has zero for dropped packets.
My router is a Routerstation Pro, running OpenWRT. It seems to work fine for other computers via Ethernet or Wifi.
Are there any other diagnostics or tests I can run on this system to see what's going on? It would be really nice to get Arch running on it .
Or any ideas what might be causing this?
Cheers,
Victor

heya,
Hmm, I checked my router logs - it's running OpenWRT 12.09-beta2, and I've set the logging level to Debug.
There doesn't seem to be much relevant in the logs (at least that I can see) :
Nov 3 11:40:01 OpenWrt daemon.info hostapd: wlan0: STA e4:ce:8f:4b:59:5c WPA: group key handshake completed (RSN)
Nov 3 11:40:09 OpenWrt daemon.info hostapd: wlan0: STA a0:0b:ba:ce:9f:ad IEEE 802.11: deauthenticated due to local deauth request
Nov 3 11:40:16 OpenWrt daemon.info hostapd: wlan0: STA a0:0b:ba:ce:9f:ad IEEE 802.11: authenticated
Nov 3 11:40:16 OpenWrt daemon.info hostapd: wlan0: STA a0:0b:ba:ce:9f:ad IEEE 802.11: associated (aid 1)
Nov 3 11:40:16 OpenWrt daemon.info hostapd: wlan0: STA a0:0b:ba:ce:9f:ad WPA: pairwise key handshake completed (RSN)
Nov 3 11:40:16 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPREQUEST(br-lan) 192.168.3.195 a0:0b:ba:ce:9f:ad
Nov 3 11:40:16 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPACK(br-lan) 192.168.3.195 a0:0b:ba:ce:9f:ad android-8cb428f62edb58a1
Nov 3 12:42:03 OpenWrt daemon.info hostapd: wlan0: STA e4:ce:8f:4b:59:5c WPA: group key handshake completed (RSN)
Nov 3 12:42:11 OpenWrt daemon.info hostapd: wlan0: STA a0:0b:ba:ce:9f:ad IEEE 802.11: deauthenticated due to local deauth request
Nov 3 12:42:11 OpenWrt daemon.info hostapd: wlan0: STA a0:0b:ba:ce:9f:ad IEEE 802.11: authenticated
Nov 3 12:42:11 OpenWrt daemon.info hostapd: wlan0: STA a0:0b:ba:ce:9f:ad IEEE 802.11: associated (aid 1)
Nov 3 12:42:11 OpenWrt daemon.info hostapd: wlan0: STA a0:0b:ba:ce:9f:ad WPA: pairwise key handshake completed (RSN)
Nov 3 12:42:12 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPREQUEST(br-lan) 192.168.3.195 a0:0b:ba:ce:9f:ad
Nov 3 12:42:12 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPACK(br-lan) 192.168.3.195 a0:0b:ba:ce:9f:ad android-8cb428f62edb58a1
Nov 3 12:43:38 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPDISCOVER(br-lan) 02:90:25:00:0a:0a
Nov 3 12:43:38 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPOFFER(br-lan) 192.168.3.188 02:90:25:00:0a:0a
Nov 3 12:43:38 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPDISCOVER(br-lan) 02:90:25:00:0a:0a
Nov 3 12:43:38 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPOFFER(br-lan) 192.168.3.188 02:90:25:00:0a:0a
Nov 3 12:43:42 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPDISCOVER(br-lan) 02:90:25:00:0a:0a
Nov 3 12:43:42 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPOFFER(br-lan) 192.168.3.188 02:90:25:00:0a:0a
Nov 3 12:43:47 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPDISCOVER(br-lan) 02:90:25:00:0a:0a
Nov 3 12:43:47 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPOFFER(br-lan) 192.168.3.188 02:90:25:00:0a:0a
Nov 3 12:44:01 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPDISCOVER(br-lan) 02:90:25:00:0a:0a
Nov 3 12:44:01 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPOFFER(br-lan) 192.168.3.188 02:90:25:00:0a:0a
Nov 3 12:44:11 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPDISCOVER(br-lan) 02:90:25:00:0a:0a
Nov 3 12:44:11 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPOFFER(br-lan) 192.168.3.188 02:90:25:00:0a:0a
Nov 3 12:44:23 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPDISCOVER(br-lan) 02:90:25:00:0a:0a
Nov 3 12:44:23 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPOFFER(br-lan) 192.168.3.188 02:90:25:00:0a:0a
Nov 3 12:44:34 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPDISCOVER(br-lan) 02:90:25:00:0a:0a
Nov 3 12:44:34 OpenWrt daemon.info dnsmasq-dhcp[1398]: DHCPOFFER(br-lan) 192.168.3.188 02:90:25:00:0a:0a
I also installed dnsutils, and tested host, first with Google's DNS server (8.8.8.8):
[victorhooi@arch-precision ~]$ host -d www.google.com 8.8.8.8
Trying "www.google.com"
Using domain server:
Name: 8.8.8.8
Address: 8.8.8.8#53
Aliases:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 577
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 114 IN A 74.125.237.115
www.google.com. 114 IN A 74.125.237.116
www.google.com. 114 IN A 74.125.237.112
www.google.com. 114 IN A 74.125.237.114
www.google.com. 114 IN A 74.125.237.113
Received 112 bytes from 8.8.8.8#53 in 31 ms
Trying "www.google.com"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5320
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN AAAA
;; ANSWER SECTION:
www.google.com. 299 IN AAAA 2404:6800:4006:802::1012
Received 60 bytes from 8.8.8.8#53 in 173 ms
Trying "www.google.com"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 14585
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN MX
;; AUTHORITY SECTION:
google.com. 59 IN SOA ns1.google.com. dns-admin.google.com. 1502115 7200 1800 1209600 300
Received 82 bytes from 8.8.8.8#53 in 196 ms
Using's Google's DNS, everything seems to be fine.
Then I tested it with my OpenWRT router set as the DNS server (192.168.3.1):
[victorhooi@arch-precision ~]$ host -d www.google.com 192.168.3.1
Trying "www.google.com"
Using domain server:
Name: 192.168.3.1
Address: 192.168.3.1#53
Aliases:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58738
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 162 IN A 74.125.237.146
www.google.com. 162 IN A 74.125.237.148
www.google.com. 162 IN A 74.125.237.144
www.google.com. 162 IN A 74.125.237.145
www.google.com. 162 IN A 74.125.237.147
Received 112 bytes from 192.168.3.1#53 in 3 ms
Trying "www.google.com"
;; connection timed out; no servers could be reached
Trying "www.google.com"
;; connection timed out; no servers could be reached
It does the first part quite quickly - then it gets to the "Trying "www.google.com"" line - then hangs there for a while, before printing the two "connection timed out" lines.
Does the above help at all?
I also noticed when I run host without debug output against Google's DNS server, it mentions the last address is a IPv6 address:
www.google.com has IPv6 address 2404:6800:4006:802::1012
Is that a red herring, or might IPv6 have anything to do with it?
I've also pasted the contents of /etc/config/dhcp - which is the configuration file for dnsmaq on OpenWRT, and controls both DHCP and DNS:
config dnsmasq
option domainneeded 1
option boguspriv 1
option filterwin2k 0 # enable for dial on demand
option localise_queries 1
option rebind_protection 1 # disable if upstream must serve RFC1918 addresses
option rebind_localhost 1 # enable for RBL checking and similar services
#list rebind_domain example.lan # whitelist RFC1918 responses for domains
option local '/lan/'
option domain 'lan'
option expandhosts 1
option nonegcache 0
option authoritative 1
option readethers 1
option leasefile '/tmp/dhcp.leases'
option resolvfile '/tmp/resolv.conf.auto'
#list server '/mycompany.local/1.2.3.4'
#option nonwildcard 1
#list interface br-lan
#list notinterface lo
#list bogusnxdomain '64.94.110.11'
config dhcp lan
option interface lan
option start 100
option limit 150
option leasetime 12h
config dhcp wan
option interface wan
option ignore 1
What do you think the next steps are? I'm happy to run a tcpdump, if you think that would help? Or any other ways to get more data on what's happening?
Cheers,
Victor

Slow network speed during peak times

I have begun experiencing very slow network speeds in the evening. My Mifi and other devices go from routinely getting 10 MBS down to 1 MBS in the evening. Is there any way to address this?

Rickrdn1,
Thank you for all of the detailed information. The coverage in the area looks great. All of your devices seem to drop in speeds at the same time? How is voice and text working during these times? The coverage in the area looks great, but can still be affected by congestion at peak times of usage. We may want to investigate your area further with a remedy ticket.
TrevorC_VZW
Follow us on Twitter @VZWSupport

Very slow download speeds with ATT U-Verse

Hello,
Experiencing very slow download speeds with Macbook Pro 2011, on Lion, and ATT UVerse Max, which should allow for an avg. 11-12 MBPS speed. Instead, I get a fluctuating 60-370 kbps speed. I am not experiencing this problem on my Windows machines (Laptop running Windows 7 and Desktop on XP), it is only affecting the Macbook pro. I wonder if this issue is a known problem with ATT U-Verse and Macs, I spent hours yesterday with their support online and they couldn't help me, stating that from their side all settings were OK; the first representative from ATT re-booted the router remotely and that seemed to work for about 10 minutes, and then it went back to a crawling speed...
Any suggestions welcome!
Thanks

Do you have QOS enabled in your router? Did you try plugging the win7 laptop directly and check the speed?

Poor network speed with 1st generation time capsule and multiple airport express 5Ghz. My network speed slows to a crawl when not close to the time capsule. I get the range that I need, but the speed is painfully slow.

Hello,
I have a first generation time capsule running 802.11n (b/g compatable) and the airport expresse's are the newer 5ghz models. I have 3 airport express's and I have the range that I need. I can run the time capsule using 802.11n 5ghz, but I loose the range and can't connect to all of the airport express's. My computers and mobile devices run 802.11n. Does anyone have any suggestions on how to increase the network speed. Would the new airport extreme fix the problem?
Thank you

Unfortunately, you are experiencing one of the downsides to 5 GHz. That's because the higher frequency 5 GHz signals are much weaker than 2.4 GHz signals.
After all, you always have to give up something to gain something else. In the case of 5 GHz, you gain potential speed but in return, you must give up penetration power and distance capability.
In order to work well, 5 GHz signals need to almost have a line-of-sight relationship between devices. Unless you can achieve this, you will do much better to leave the Time Capsule running at the 802.11n (b/g compatible) 2.4 GHz Radio Mode and allow the Express devices to "extend" that network.
As for the location of the AirPort Express devices in an exended network, that is critical for best performance. That's because the Express can only "extend" the quality and bandwidth of the signal that it receives. Post back if you need a few more tips on how to find the best location for the AirPort Express devices.
Would the new airport extreme fix the problem?
Unfortunately, no.

Very slow transfer speeds with external hard drives through Firewire and US

Hi All,
My external drives transfer very slowly on my MacPro. I've been searching for answers and have turned up very little. Apple support suggested I post my issue here. Just to make a note, I measured my disk speeds with both AJA System Test and copying files between drives and reading the Disk Activity in Activity Monitor.
I have 3 external drives, all MyBook Premium or Professional, 1x 500GB, 1x 1TB and 2x 1TB in RAID 0. I had them on Firewire 400 and the RAID 0 2TB one on Firewire 800. My transfers on FW were all around 24MB/sec on all drives (much less than what I should be getting with FW400). I then read somewhere that the FW bus on the MacPro uses the slowest speed connected for all FW connections. So I unplugged everything but the FW800 Raid 0 drive and my transfer rate jumped to 40-60MB/sec. This is much better, but still about half or so of what I expect it should be producing from an external RAID 0 setup.
To keep my FW800 backup drive faster, I've plugged the other two into USB2.0. The transfer speeds on both drives are now hideous, around 10-15MB/sec. This is so slow, but I'm not sure what to try to fix my speeds.
The HD's in the external drives are all 7200rpm, and all should be transferring at a higher rate. Do you have any suggestions or ideas? Ideally I'd like to get everything transferring at rates they should be transferring at, but I'll settle with my current FW800 speed of 40-60MB/sec if I can get my other two drives transferring at a non-snail pace.
Is this a common issue? I can't believe I'm the only one plugging multiple external hard drives into their Mac Pro. I hope someone has a fix or solution for this. I'm all ears!
Thanks in advance.

Hi Kappy, thanks for the information.
So I rejigged my setup a tad. My RAID 0 is still FW800, the second drive is back on FW400 on the back port, and the third is USB 2.0 on the back as well.
It's interesting to note that I saw the FW800 taking a bandwidth hit if the FW400 drives was being read/written to. For example, if I was averaging 50-60MB/sec on the FW800 drives and copy something large to the FW400 drive, each drive averages out to about 30/MB second, roughly half the FW800 speed I was getting. The USB while the slowest didn't cause any slowness on the FW drives.
Here are my Xbench results. These results are from each drive being benchmarked individually with no other drives being tested at the same time.
*MyBook 2TB in a RAID 0 configuration: Firewire 800*
Results 75.42
System Info
Xbench Version 1.3
System Version 10.5.5 (9F33)
Physical RAM 16384 MB
Model MacPro3,1
Drive Type WD My Book
Disk Test 75.42
Sequential 80.92
Uncached Write 69.16 42.46 MB/sec [4K blocks]
Uncached Write 110.79 62.68 MB/sec [256K blocks]
Uncached Read 53.66 15.70 MB/sec [4K blocks]
Uncached Read 136.76 68.73 MB/sec [256K blocks]
Random 70.62
Uncached Write 36.38 3.85 MB/sec [4K blocks]
Uncached Write 140.55 45.00 MB/sec [256K blocks]
Uncached Read 93.26 0.66 MB/sec [4K blocks]
Uncached Read 88.38 16.40 MB/sec [256K blocks]
*MyBook 1TB on Firewire 400*
Results 47.73
System Info
Xbench Version 1.3
System Version 10.5.5 (9F33)
Physical RAM 16384 MB
Model MacPro3,1
Drive Type WD My Book
Disk Test 47.73
Sequential 52.47
Uncached Write 48.45 29.74 MB/sec [4K blocks]
Uncached Write 53.76 30.42 MB/sec [256K blocks]
Uncached Read 43.69 12.79 MB/sec [4K blocks]
Uncached Read 70.91 35.64 MB/sec [256K blocks]
Random 43.78
Uncached Write 17.29 1.83 MB/sec [4K blocks]
Uncached Write 98.83 31.64 MB/sec [256K blocks]
Uncached Read 76.33 0.54 MB/sec [4K blocks]
Uncached Read 97.01 18.00 MB/sec [256K blocks]
*MyBook 500GB on USB 2.0*
Results 40.60
System Info
Xbench Version 1.3
System Version 10.5.5 (9F33)
Physical RAM 16384 MB
Model MacPro3,1
Drive Type WD 5000AA External
Disk Test 40.60
Sequential 35.99
Uncached Write 37.31 22.91 MB/sec [4K blocks]
Uncached Write 37.22 21.06 MB/sec [256K blocks]
Uncached Read 26.62 7.79 MB/sec [4K blocks]
Uncached Read 50.27 25.27 MB/sec [256K blocks]
Random 46.55
Uncached Write 20.37 2.16 MB/sec [4K blocks]
Uncached Write 68.44 21.91 MB/sec [256K blocks]
Uncached Read 93.55 0.66 MB/sec [4K blocks]
Uncached Read 86.71 16.09 MB/sec [256K blocks]
So Kappy are you saying that those speeds look normal?
Thanks

Slow Networking Speed

Hey,
I am getting some problem with the Internet on my virtual machine. I tested the speed with speedtest-cli tool, its showing me
Download: 26.03 Mbit/s
Upload: 13.28 Mbit/s
but the actual speed i am getting is :
100 - 200 kbps as downloading
and upload speed is also very slow.
how can i get the fast internet speed???
kindly resolve this issue.
Thanks in advance.

Hello Hemant Thakur,
1. What is the size of the Virtual machine that you have deployed on Azure?
There could be several reasons that the VM has a network performance issues. To check if there are any issues on the platform end, I suggest that you try the steps below:
I suggest that you restart your Virtual Machine to see if it makes the difference. You can do this by logging into your Virtual Machine or from the Azure Management portal.
If this does not work, I suggest that you resize your Virtual Machine. You can refer to the link below that will give you information on how to accomplish this:
https://msdn.microsoft.com/en-us/library/dn168976(v=nav.70).aspx
If these steps do not work, we might have to further invertigate this issue. I suggest that you create a Support ticket with us. You can follow the link below to create a Support ticket:
http://azure.microsoft.com/en-in/support/options/
Thanks,
Syed Irfan Hussain

Very slow download speed with intermittent halts

Need some help.
I run Apple os/x latest version and have since yesterday begun to experience constant very slow download speeds.
I have rebooted the router and I have reset it. I have tested with wireless and wired into router. No real change.
The results are below and are pretty consistent no matter when or with what computer I test it with.
This is very frustrating and I would like to know if anyone has experienced this and if there is anything I can do before calling for service.
Thank you in advance.
Checking for Middleboxes . . . . . . . . . . . . . . . . . . Done
SendBufferSize set to [131768]
running 10s outbound test (client to server) . . . . . 5.44Mb/s
running 10s inbound test (server to client) . . . . . . 1.94Mb/s
------ Client System Details ------
OS data&colon; Name = Mac OS X, Architecture = x86_64, Version = 10.8.2
Java data&colon; Vendor = Apple Inc., Version = 1.6.0_37
------ Web100 Detailed Analysis ------
Client Receive Window detected at 359104 bytes.
10 Mbps Ethernet link found.
Link set to Full Duplex mode
Information: throughput is limited by other network traffic.
Good network cable(s) found
Normal duplex operation found.
Web100 reports the Round trip time = 22.89 msec; the Packet size = 1448 Bytes; and
There were 159 packets retransmitted, 288 duplicate acks received, and 394 SACK blocks received
The connection stalled 9 times due to packet loss
The connection was idle 2.01 seconds (16.75%) of the time
This connection is sender limited 35.49% of the time.
This connection is network limited 64.51% of the time.
Excessive packet loss is impacting your performance, check the auto-negotiate function on your local PC and network switch
Web100 reports TCP negotiated the optional Performance Settings to:
RFC 2018 Selective Acknowledgment: ON
RFC 896 Nagle Algorithm: ON
RFC 3168 Explicit Congestion Notification: OFF
RFC 1323 Time Stamping: ON
RFC 1323 Window Scaling: ON
Information: Network Middlebox is modifying MSS variable
Server IP addresses are preserved End-to-End
Information: Network Address Translation (NAT) box is modifying the Client's IP address
Server says [71.100.xxx.xxx] but Client says [192.168.1.9]

Both wired or wireless.
auto - negotiate
Thank you.

V. Slow transfer speeds with new dual band Airport Extreme

I have a new Airport Extreme (late 2009, dual band, full 'N' spec) which I am using to replace an older Airport Extreme (early 2008, 5Ghz, 'draft' N).
I have a USB disk attached and was interested in benchmarking the transfer speed of the new Extreme, compared to the previous version. The results are puzzling / alarming.
Shown below are transfer speeds (file copied to the attached USB drive) under different connection standards (2.4Ghz / 5Ghz & a/b/g/n)
'Old' Airport Extreme
5Ghz - 'draft' N : ~5-7 Mb/sec
'New' Airport Extreme
2.4Ghz - b/g : ~3-5 Mb/sec
5.0Ghz - a : ~3-7 Mb/sec
5.0Ghz - N : ~200 Kb/sec
Hence transfer speeds appear to collapse when I try to make use of the 'N' spec with the latest Extreme. I have tried altering items such as - wide channels (on / off), interference robustness (on / off), 5Ghz channel (manual, instead of auto), with no upside.
I seem to be at the point of concluding that either
1. I have a 'broken' Airport Extreme
2. The WiFi card on my early 2008 iMac (which implements I guess the 'draft' N standard) is 'incompatible' with new the Airport Extreme under a 'N' connection.
Any thoughts ?

Since all devices in my wireless network are capable of latest 802.11n protocol, I really do not need older and slower 802.11a/b/g protocols. To achieve above 200 Mbit/sec, 5GHz band with wide channel option turned on is really necessary. Thus I really wish I can turn off the 2.4GHz radio band (seems Apple has set this band as default) of my new dual band Airport Extreme to avoid unwanted bandwidth degradation. Unfortunately this is not possible with radio mode setting in Airport Utility.
The best I can do to force connection with 5GHz radio band (with quite consistent result) is as follows:
On Airport Extreme through [Airport Utility>Wireless] :
Radio Mode: 802.11n only (5Ghz) - 802.11b/g/n
More Options>Wireless Network Option>Transmit Power: 100%
More Options>Wireless Network Option>Use Wide Channels: checked
More Options>Wireless Network Option>5 GHz Network Name:
checked and same network name with extra suffix "(5 GHz)"
On 27" iMac through [System Preferences>Network>AirPort>Advanced>AirPort]:
Preferred Networks:
Create only one profile in Preferred Networks for the above network name with suffix "(5GHz)"
Uncheck the option [Remember networks this computer has joined] to ensure there is only one profile under Preferred Networks .
Once all above settings are done, restart Airport Extreme in Airport Utility. Your computer should connect wirelessly to the base station through 5GHz band after booting most of the time. Even when it is not occasionally, simply go to the Airport icon in main menu bar and click on the network name with suffix "(5GHz)" in dropped-down list to connect manually. With all these settings, I have achieved 300 Mbit/sec bandwidth on my iMac most of the time for fast Time Machine backup.
How I wish feature for better radio mode control by end user will be implemented in next update of Airport Utility. Apple should trust end user's brain better than artificial intelligence (or ignorance ?) in wireless network implementation. Wireless traffic between the two radio bands and among various wireless devices should be segregated specifically in Airport Utility by end users whenever dual band Airport base stations are in use.

Slow wireless speed with new iMac Intel- problem with 802.11g?

There IS a problem with the new Intel Mac, I have tried both the Intel iMac and the new Intel Mac mini and they both have the same problem with slow wireless speed (or rather it variates, if I do a ping to another computer on the network the speed goes from < 1 ms up to 1000 ms and then down to < 1 ms and so on). The older mac minis, my Linux boxes and my Windows PCs don´t have that problem. I have also read reports on the net and it appears that most users experiencing this problem have wireless card firmware version 101.3 (3.120.28.3) . A possible "fix" is to change to 802.11b on the router and then it works. No speed fluctuations and a stabile network! I know it is a bad solution, I would prefer to use 802.11g and get the speed. However I think this points to a problem with the drivers regarding 802.11g. I am starting up a new thread on this and those of you with problems, please try to switch to 802.11b and if it works let us make Apple aware of this.
/Tobbe

Which home hub do you have?
There is some general help at this link Wireless connection problems
There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.

Very slow network speed

Since I changed from Mac OS 9.2.2 to Mac OS X 10.3.9 on my dual 450 Power Mac i am having always the same problem. after some new starts my network speed becommes very slow. internet, printer connection and also when using personal file sharing. Folder of 22MB takes about 1 hour insted of 3 seconds to send from one mac to the other. I was trying on both HD´s and with only security update from CD before using Internet. I also have to repair volume permissions.tried reset of PRAM. tried it with both HD´s separately installed, sometimes it helped for short time. but unfortunately I always get the problem also when I am not using intenet connection after installing 10.3.9 on a completely empty HD (also tried to formate mith zeros). On my other mac´s: G3 (400MHz), G4 (500MHz) PowerBook and Power Mac G4 450(single)
the system is working without any problem. same settings! Only the Power Mac G4 dual 450 I am having this problem. Software like Photoshop, X-Press and also Maxxon 4D are running fast and without problems. Please help me!!!

Since I changed from Mac OS 9.2.2 to Mac OS X 10.3.9 on my dual 450 Power Mac i am having always the same problem. after some new starts my network speed becommes very slow. internet, printer connection and also when using personal file sharing. Folder of 22MB takes about 1 hour insted of 3 seconds to send from one mac to the other. I was trying on both HD´s and with only security update from CD before using Internet. I also have to repair volume permissions.tried reset of PRAM. tried it with both HD´s separately installed, sometimes it helped for short time. but unfortunately I always get the problem also when I am not using intenet connection after installing 10.3.9 on a completely empty HD (also tried to formate mith zeros). On my other mac´s: G3 (400MHz), G4 (500MHz) PowerBook and Power Mac G4 450(single)
the system is working without any problem. same settings! Only the Power Mac G4 dual 450 I am having this problem. Software like Photoshop, X-Press and also Maxxon 4D are running fast and without problems. Please help me!!!

Slow wifi speeds with imac 3.06ghz

Hello,
So I just got my new imac 3.06ghz with 2gb of ram and I have noticed the internet speed when using wifi is extremely slow. Currently I am using a linksys wrt54G router with time warner cable. If I have my old 1st gen macbook side by side with my imac the macbook shows full signal strength on the airport and the imac shows only a few bars. If I run a speed test with them both the macbook downloads at around 1.5mb and the imac gets a blazing 51k.
Weird symptom on the imac is the blue status bar starts to load in safari, it gets about 3/4 through and then freezes and sits at 3/4 done for a few minutes. During this time images and text on the site slowly start to show up, just like if you were back on a dialup connection.
Troubleshooting that I have done:
reset smc and pram
erase and install
downloaded all available software updates
changed the channel that the router is broadcasting on
- router security is using wep and mixed b&g
- other devices that work fast with a wireless connection on the router are an iphone, xbox 360 and nintendo ds
* even tried testing with win xp and bootcamp but I haven't figured out how to get windows to recognize the wireless card yet
So i'm at the point where I'm assuming this is a hardware issue, maybe the airport antenna?
Any other suggestions?

Everyone on here that is experiencing these wifi issues with their new iMacs NEEDS to call Apple and get this elevated. I'm out of the country right now but I'm in the middle of troubleshooting this issue with Apple. I've spoken with several techs and most don't read this forum and are unaware of any widespread wifi issue with the iMacs. When I return home I will be continuing my troubleshooting with Apple on this issue. My symptoms are very similar to the ones posted in several recent threads on this issue. So far it is pointing to a software problem but I can't rule out the hardware yet. However using BootCamp I can launch Windows Vista on the same machine and surf the internet at high speed through the same Time Capsule. Also all other PC's on my home network are connecting to the Time Capsule at high speed with no hiccups. I didn't notice the problem until all the updates were loaded onto my new iMac which I received July 18th.

Help : very slow connection speed with AEBS and iMac

I connect to the internet using my newly purchased AEBS. I have a MacBook and an 24" iMac ( purchased in Nov 2007). My iMac showed very slow connecting speed of <1 MB/s download; with my MacBook placed just 1 foot from my iMac, the MacBook showed an amazing download speed of 20MB/s. If i connect the iMac to the AEBS using ethernet cable, it can get a very high speed.
So, where is the problem??
I am new to wireless, please help. I use iMac more than my MacBook at home.
Actually, i did not touch the any of the advance setting of the AEBS.

You know, I am experiencing the same problem. My wife's PC and iPhone are blazing fast, but my MacBook is accessing the internet at about dial-up speeds. Very frustrating and I haven't yet found the culprit.
Anyone???

Slow transfer speed with Airport Express N in an N-only 5Ghz network.

I have a Time Capsule set to 802.11n-only (5GHz).
My new Airport Express N is set to extend such network.
I have a Mac Mini connected via Ethernet to the ethernet port of the Airport Express; however when I transfer files from the Mac Mini to Time Capsule the speed is incredibly slow (1 Megabyte of data every 3-4 seconds).
I know I'm supposed to get 100Mb/s via the Ethernet airport.
Any ideas?

I have the same problem with the 5ghz mode from my time Capsule. The connection is fine until the wireless connection is maxed out, then the wireless conenction drops and I have to click on the airport toolbar icon to get it reconnected (Just click on the menu item...I dont actually have to re-select the wireless network).
Dropping down to the 2.4ghz mode solves the problem, but I want the bandwidth increase 5ghz gives me. Thats why I bought the Time Capsule to begin with.
Some have said that this issue started with Leopard. I cannot confirm this since I didnt have any 802.11n equipment until after I upgraded to Leopard. Also, I noticed that with Time Capsule firmware 7.3 the connection drops but the airport icon stays solid. In 7.3.1 the connection drops and the airport icon greys out (indicating no connection).

Very slow 3G speeds with internal card on Vodafone network: solved!

I'm running the internal 3G card on the Vodafone network in Australia (ThinkPad x200s, Vista) and a couple of weeks ago it slowed right down to less than dialup speed for no reason, and the speed hasn't picked up since.
I finally figured out how to resolve the issue today. I downloaded the Vodafone Internet Connect utlility and now my Internet speeds are restored to 3G speed. However, if I use ThinkVantage Access Connections utility to connect to the Vodafone HSDPA network, the 3G speed crawls again. It appears this is a bug in Acess Connections utility and I'm not sure why it appeared (probably related to a Vista update).
Anyway, if you come across this issue, you should download and connect using the Vodafone Internet Connection utility, which contains many handy features including a usage meter and SMS features.

By process of elimination I realised that the only cause of the sudden slowness must be software that I had installed recently. The only software I had added was a wifi utility to detect available networks--open or protected. Unlikely as it sounds, quitting the utility (which I had set to load on startup) made a dramatic improvement in performance.

Slow Network Speed with MacPro

Similar Messages

Maybe you are looking for