Ok, my thought that 10.5.3 changed the order of DNS server priority is wrong.

When a Network Location is setup through DHCP (everything assigned by your router/ISP) and you add DNS servers to this location, the servers are used in reverse order, such as you are seeing arbushell. Last server entered is the first to be used.

When you create a new Network Location and/or manually set TCP/IP configuration (i.e. you specify your IP address, your gateway, your subnet, your DNS servers), the DNS servers are used in the order entered, top down.

Thanks for helping me clear up the confusion.

This behavior has not changed since 10.5.0.

I had this problem but never found this thread until now...

I found a blog which gives a pretty basic walkthrough on how to fix this problem, they seem to use OpenDNS, but obviously if you have your own ISP DNS server it would be better.

http://blog.tando.com.au/mac-osx/sol...ac-osx-leopard

This Worked For Me
 

This may seem like total newbietardation, but here goes. My email (especially sending) and browser started to slow down significantly today, for no apparent reason. I tried plugging in directly with the ethernet cable and then everything worked fine again, so obviously an Aiport issue (I have a 2 week old MPB, fully loaded - 4GB RAM, 2.6 Proc., 300GB HD).

Anyway, I did nothing with my Airport settings - powered off the MPB, and turned off and disconnected all wires from my modem and the Airport base station. Then first plugged in the power on the Airport base until the flashing lights stopped and the signal lights kicked on. Then screwed my cable connector into the modem, and finally the modem power plug, waited for all the lights to come on and stabilize and then powered up the MPB and voila, Airport found my network followed by superfast internet and email once again.

same prob here
 

I'm having the same problem. Except that im in Tiger and my download speeds are crap. I've done everything I can think of. So I finally ran an archive install. It solved the problem. But as soon as I migrated some files, I was back to crap internet again. So this may or may not be the problem but some files that you have installed may be affecting your network. I know this is a computer problem because I have 2 other macs in my house that work perfectly. I still have not found a solution to this terrible problem.

Thanks
 

Thanks to the good tips here, I realize that if you add a dns server at the END of the dns server list, that server is used first. So adding an opendns server to your DNS preferences [for me, that meant network preferences->airport->advanced->DNS->add 208.67.222.222 to the BOTTOM of that list worked! Thank you!]

I personally would add both open DNS servers to the list :
208.67.220.220
208.67.222.222

Unlikely that it is that the first server will be down then the secondary one will be in list to do name resolution. Personally i find distinct advantages using OpenDNS especially on laptops when roaming between many networks so you are not relying on crappy router DNS lookup or ISP DNS.

I had issues on my wife's iMac. Changing the DNS servers didn't do anything, even when I ran a DNS server *on her machine*, which returned queries in 0mS once it had resolved a name.

Here is my documentation of the solution. The summary is that once I started running all her traffic through a SOCKS proxy to my firewall, using ssh for the proxy, the problems are completely gone.

http://www.grubinski.com/hints/leopard.networking.html

Mike

Soooooo frustrated, this may be the last Apple computer I buy
 

I am having the exact same problem being described in this thread.

My Safari browser now basically won't even launch, and my Firefox browser is excruciatingly slow, to the point that I want to throw my Apple computer out the window.

I have an iMac G5; (Power PC G5) that I installed Leopard on.

I have tried the suggestion of changing the DNS server number as others have done in this forum, but, like the others, that made no difference.

I am angry that after spending so much money on a Mac (and I have been a lifelong Mac devotee) I am now zipping around the Internet and posting this with a cheap Dell laptop.

I know it is a problem with my Apple, and not my internet connection, because I am hooked to the same internet connection on the laptop and do not have a problem with the laptop

Can anyone help me (I'm not a tech person, so I don't want to have to remove the back of iMac)??

If I can't fix the problem, that may be the last Mac I buy.

It might be useful to cut the visual parts of the browser out of the equation by using a text-only browser as a test to see what part of the HTTP transaction is causing a problem.
Try the 'debug_http' script that I outlined in this old thread:
http://forums.macosxhints.com/showpo...91&postcount=7
Show us the results and we can help interpret.

Same problem
 

I'm having the same problem, and this is what I got through that debug script...

Any thoughts?

That indicates a quite reasonably fast download of the HTML for that Apple site. Do you have a problem (slowness) with that site?

My mistake
 

I think I was still connected to the ethernet when I did that test.. I'm an idiot. Here's the results using airport.

That is still relatively ok for speed.
Your name lookup (DNS) is a bit slow (taking 0.4 seconds), so maybe look at what DNS servers you have configured for Airport.

On the off chance that this helps anyone. I've experienced "the problem" when using these Comcast DNS servers and DHCP:

68.87.73.242
68.87.71.226
68.87.64.196

On a hunch I just reset my router/modem gateway. When things were up and running again, DHCP acquired the following Comcast DNS servers:

68.87.73.246
68.87.71.230

Now everything is working fine.

Cured
 

OK.. My problem was not a DNS issue. This happened to me before - suddenly slow internet after a leopard patch. I should get 9.8Mbps. I was getting 1.9 tops. Last time the problem went away when I got a time capsule (I was getting one anyway, so I figured, give it a go..). That was after reinstalling 10.5 from my DVD and upgrading. Reinstalling never helped (though I did preserve all files and settings). This time I cured it by running the setup assistant in netwoerk settings and allowing it to set up a new location for my built in airport extreme. I also deleted all previous locations. That worked perfectly. Still have no idea what was wrong, but I wish I had tried this last time I hit this problem.

Slow internet speed....
 

Macbook 10.6.2 - just fine.

iMac 10.6.2 - not so much. I have tried reinstalling snow, countless DNS servers, updates, name it and ive probably done it.

Set up:

router --> 4-port linksys --> 1. airport 2. Samsung TV --> xbox 360 --> Lacie NAS

Macbook can connect to airport with full bars and, from speedtest.net, can get 3.82 dl and .6 ul and ping 15 ms. I can cruise sites at normal speed with hardly any lag. Youtube, most video sites, and websites load just fine.

I also have a wii and xbox 360 that connects to the airport. Both work just fine and download updates pretty quick. Online playing is fine with hardly any lag.

Samsung TV connects to the 4 port via ethernet and that loads online news/weather/and online content a.o.k.

Lacie NAS is connected to the 4 port, but connect from the macbook and imac through the airport and they transport files via wireless to the 4-port at normal speeds. I have not exprienced problems.

...now the imac. same issues as other people here have exprienced. slow speeds, slow downloads, and even though i always get full bars, internet speed is sporadic most of the time.

I did 'curl url_of_web_page -o /dev/null' and here is what i got

Last login: Tue Feb 2 18:13:08 on ttys000
Madrigals-Computer:~ salinamadrigal$ curl youtube.com -o /dev/null
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
148 296 148 296 0 0 756 0 --:--:-- --:--:-- --:--:-- 1487
Madrigals-Computer:~ salinamadrigal$ debug_http () { /usr/bin/curl $@ -o /dev/null -w "name lookup: %{time_namelookup} connect: %{time_connect} pretransfer: %{time_pretransfer} starttransfer: %{time_starttransfer} total: %{time_total}\n" ; }
Madrigals-Computer:~ salinamadrigal$ debug_http youtube.com
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
148 296 148 296 0 0 859 0 --:--:-- --:--:-- --:--:-- 1566
name lookup: 0.052 connect: 0.155 pretransfer: 0.155 starttransfer: 0.344 total: 0.344
Madrigals-Computer:~ salinamadrigal$



I tried youtube, since i cant ever depend on the imac for any internet use, especially downloading any type of media content. the imac works for everything else but internet.

any help would be appreciated.

As a lifelong Windows guy I just bought my first Mac. An iMac Core2Duo with 4 gigs of RAM and I'd say my online speed is about 1/3rd of what I was getting two days ago on my same equipment with Windows XP. I am SHOCKED how slow this thing is running online.

Ohh and hello everyone, first post, only had a Mac for 2 days.

Hi, I followed all suggestions on this thread, used open DNS, reset modem and router, upgraded firmware, updated software, etc, etc. None of that worked.

Spent about 4 hours working on this.

This finally worked --

Open System Preferences - Network. Go into the properties for your connection and click on the TCP/IP tab. Then click the Configure IPv6 button and set the menu to Off. Click OK and then Apply Now.

Good luck!

To give credit, I found that solution at this site --
http://hints.macworld.com/article.ph...50504161223778

To be clear, suddenly with no changes so far as I can tell, anything using a search site worked VERY slowly (2 mins to time out). Google, gmail, yahoo, bing, etc. Mac to Modem worked fine. Mac to router did not (direct or wireless). Windows PCs worked fine, even wireless, this was only a problem with macs on google, etc. As I said, turning ovver IPv6 as described above fixed this problem for me.