Internet connection tempermental and slow

Hi,
For about two week now my iMac has been dropping connection quite regularly, or running incredibly slow for a few minutes at a time. It's a problem that exclusively affects my Mac (my mobile and tablet work flawlessly at all times on the same network). When the connection cuts out completely the Wi-Fi menu bar icon remains black, suggesting it's connected even though it isn't.
I can resolve the issue by turning the Wi-Fi off and on, or resetting the router, but the problem will usually come back within 30 minutes. I think the chances of it cutting out are increased when I try doing something network intensive, like downloading a large file or streaming video / watching YouTube. I've tried renewing DHCP lease (whatever that does) and yes, I've tried turning it off and on again. I've ran a wireless diagnostics test if there's anything useful in the file anyone can use.
I'm using a mid 2010 iMac 21" running the latest version of Yosemite (10.10).
Any suggestions would be much appreciated.

They will. But given the fact that it is so difficult to reliably reproduce this issue, it is very hard to classify it.
The more people sending in detailed feedback, as in step by step instructions on how to re-create the issue, the easier it will be for Apple to reproduce the issue, in-house. And once they can do that, they can begin to address the issue. And put out a fix.
I am willing to bet my computer that Apple want to fix this issue just as bad as anyone suffering from it ;-)

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Hello,
I have very similar problem. Suddenly Firefox stopped work - It was working few days after ver. 4 update. I was looking everywhere for some solution but nothing worked.
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- added full exception for Firefox into the firewall - did not worked
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- diferent proxy options (no proxy, system proxy, autodetect proxy) - did not worked
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- IE is working perfectly and without proxy
- other companies browser - did not worked too
- only IE is working
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It seems to me as hopeless situation or very clever move from Microsoft, I am forced to use IE - at least this works
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If Safari is getting very slow:
(Presumably you regularly empty your Safari cache by deleting the following file:
Home/Library/Caches/com.apple.Safari/cache.db
and clear your History)
Adding Open DNS codes to your Network Preferences, should give good results in terms of speed-up as well as added security, (including anti-phishing and redirects) (Full information about Open DNS is here: http://www.opendns.com/home-solutions ) and further independent information can be read here:
http://reviews.cnet.com/8301-13727_7-57338784-263/free-dnscrypt-tool-enhances-ma c-web-security/?tag=mncol;txt
and here:
http://www.macworld.com/article/1146064/troubleshootdns.html?t=234
If you are using a single computer: Open System Preferences/Network. Double click on your connection type, or select it in the drop-down menu, and in the box marked 'DNS Servers' add the following two numbers:
208.67.222.222
208.67.220.220
(You can also enter them if you click on Advanced and then DNS)
Sometimes reversing the order of the DNS numbers can be beneficial in cases where there is a long delay before web pages start to load, and then suddenly load at normal speed:
http://support.apple.com/kb/TS2296
If your computer is part of a network:please refer to this page: http://www.opendns.com/start/best_practices/#your_network and follow the advice given.
If you use a Router, make sure it has the latest firmware installed.
One reason for a slowness in page loading may be the 'DNS Pre-fetching' feature of Safari 5.x as is described here:
http://support.apple.com/kb/TS3408?viewlocale=en_US
You can cancel DNS pre-fetching by going to Terminal and typing:
defaults write com.apple.safari WebKitDNSPrefetchingEnabled -boolean false
You have to restart Safari for it to take effect.
If Safari seems to hang for ages:
If you have a lot of tabs open and/or a lot of pages running Flash, Safari can sometimes 'hang', requiring a restart of Safari. This can often be inconvenient, and as it is rarely Safari itself that is hanging but merely one of its plug-ins, usually Flash, there is a way using Terminal to restart the plug-ins (without restarting Safari and losing your tabs) by quitting the WebPluginHost process:
Open the Terminal from the Utilities folder in /Applications and type
killall -9 WebKitPluginHost
Note that this command kills all Safari plug-ins, not just Flash. All plug-ins should start back up when you reload the page.
Then go back to Safari and refresh any pages that were using the Flash plug-in. This also fixes the Beachball of Death. Try this whenever Safari gets slow or freezes. The later versions of Flash 10.1 onwards appear to have improved the situation somewhat, but haven't completed eliminated it.
For this and other reasons Apple switched their websites to HTML5 in January 2011:
http://www.appleinsider.com/articles/11/01/26/apple_revamps_its_public_website_u sing_html5.html
For Snow Leopard/Lion users this should also be read:
http://support.apple.com/kb/TS3408

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Internet connection comes and goes

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I think by "Time Machine" you actually mean "Time Capsule"--TC is the hardware, TM is the software the does the backups to the hardware.
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It kind of sounds like you might be describing "Internet Sharing":
http://docs.info.apple.com/article.html?path=Mac/10.5/en/8156.html
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If the computer is brand new, it may be reviewing (indexing) all you files for search. This will take a few hours to complete. Otherwise you likely have a program that is running poorly and slowing your system down.
Open the Fibder
Click the Go menu at the top of the screen
Click on utilities menu item under go
Open the Activity Monitor
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There are two distinct problems that can occur with internet connections, giving two different symptoms.
If, for example, you click on a link or enter a URL in a browser and it takes ages to start the process of loading the page, but once started it loads reasonably well, the issue is with the DNS lookup. On the other hand, if the browser finds the page and looks ready to start loading it pretty quickly, but then takes ages to render the page, the problem is far more likely to be an issue with data timing out.
In the situation where there is an apparent delay in locating servers, the problem is most likely related to the DNS settings in the system. DNS (Domain Name Service) is the means by which the system translates the addresses we find easy to remember and work with (such as www.yahoo.com) to the numbering system the internet itself uses (such as 69.147.11.210 in the case of yahoo). When you send your system off looking for an internet resource by name such as yahoo.com, it first checks with whatever DNS server you have told it to use, what the IP number is, and if that DNS server is slow to respond, the process of accessing the page/resource will appear to hang, sometimes for many seconds.
You can test is the system has a DNS issue by opening a browser and typing http://69.147.11.210 and hitting enter. This should, after a very brief pause, load the Yahoo home page. If doing it this way gives you a markedly faster page access time than usual, go to your network preference pane and open the ethernet configuration (if using ethernet - the airport for wifi or modem for dialup) and in the DNS servers section, manually enter the DNS server addresses used by your ISP. There are usually two or three and they may be listed in the ISP's help pages on the internet, in the documentation that they sent, or in your router.
Actually any valid DNS server IP addresses will do, so you can actually doa search for DNS server addresses and use any that you find. Bear in mind of course that a DNS server in your own locality, or region will be likely to be quicker to respond than a DNS server on the other side of the world... though not always!
Give that a try if the problem is with the system accessing a page to begin with.
If it's that the page loads very slowly once started, the first thing to do is clear the browser's caches (in safari, try 'reset safari' which sets it back to first-used state), which can often help. After that it may be necessary to delve into the depths of the system's IP configuration since some ISPs don't seem to have particularly Mac-friendly service configurations.

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Current Setup:
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I will refer to this setup as my tower.
The Ethernet port works fine by itself. When I use wired tethering with my Android phone (Droid 4 running on 4.0.4 Ice Cream Sandwich), it works fine when nothing is connected into the Ethernet port in the mobo.
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I would like to be able to accept the internet from my Android via a USB tether and either bridge the connection or use the internet connection sharing service to route traffic through the unused Ethernet port on the mobo (either to another computer/xbox
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I had the same problem and came here by searching.
Per Rosengren's method solved the problem, but he didn't say how to do it, so I'll try to explain step-by-step for anyone that may venture here.
Open Device Manager (right click on Computer > Manage > on the left side, under System Tools choose Device Manager)
Choose the problematic device in Network Adapters (for me it's called HTC Remote NDIS based device)
Right click on it and choose Update Driver Software...
Click Browse my computer for driver software
Click Let me pick from a list of device drivers
Uncheck the box Show compatible hardware
For the manufacturer, choose Microsoft Corporation
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- Remote NDIS based Internet Sharing Device
- Remote NDIS Compatible Device
I chose the second one and it solved the problem, but if it doesn't work you could try the other one. In my case, the driver that was being used was neither of these, but a special driver from Android SDK ADT bundle.
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Hi,
I have a wireless connection (zd1211 chip). I am always connected to the router, but when it losts internet connection (telecom italia sucks), gtk apps (not qt) freeze for about 20 seconds before they start.(seems like a connection timed out) I had ubuntu before and I hadn't this problem...
Suggestion?

Cornholio wrote:Hi,
I have a wireless connection (zd1211 chip). I am always connected to the router, but when it losts internet connection (telecom italia sucks), gtk apps (not qt) freeze for about 20 seconds before they start.(seems like a connection timed out) I had ubuntu before and I hadn't this problem...
Suggestion?
*Which* GTK apps? I suspect not all of them. Do you have mounted filesystems on NFS or something similar?
-- Thomas Adam

AEBS and internet connection errors and dns errors.

AEBS 7.3.2
It was running fine until I turned on my mybook one day like I had done several times before.
I received an error regarding a disk error with it. I could not find any problems though. But since then my AEBS has been having difficulty connecting to the internet. I can download via bit torrent, but not be able to surf the internet. I restart my internet connection, which involves turning off the power supply and restarting it, and I can surf the internet again. However, I receive a DNS server error, but everything seems to be fine, and I can surf the internet.
If I restart the AEBS it will not allow me to surf the internet, even though it says everything is fine. I can actually manage to go to google and do google searches, cant navigate away from there, but none the less new content. I have managed to download via Itunes and bit torrent but not surf to hot mail.com etc.
I know I can ignore it and the flashing amber light will go away, but that ignores the problem and doesn't fix anything. besides it still says I have an Internet connection error from day one. I dont't know why, and no ones been able to help with that.
more info:
My isp uses a dynamic IP, so I have to use the automatic dhcp setting.
AEBS uses to go back to green light and automatically resolve the dns error, now not at all.
Please help, this is very frustrating.
thanks

Bump, and of course I have set the message to ignore, which created a green light and now have 2 unresolved problem and internet works.
Still have the DNS server error, despite manually putting it in.
Still have internet connection error despite having a connection.
If I restart my airport extreme, the DNS message goes away, but does not allow me to access the internet through any web browser, but it works through one of my computers via bit torrent, but nothing else.
If I rest my internet connection I can access the internet, but recieve the DNS error. The internet connection error I have always had, for reasons unknown.
Is the extreme broken?
I have done a factory reset on the airport and hard reset on the internet complete with the unplugging everything. My connection is stable according to my ISP, and I agree with them.
This seems to be a Airport extreme problem.
Message was edited by: Ertman

Fast internet connection but very slow browsing

Hi,
For some time now we have been struggling with very slow browsing speeds. Sometimes the web page will not even load. ADSL speed checks show a good up and down speed and shown below and everything appears to run well if we simply download a file.
Do any of the numbers below indicate any problems?
We have various pc's both hard wired and connected wirelessly and the problems are the same on all. The laptop works fine on my office connection.
Any help greatly appreciated.
ADSL Line Status
Connection Information
Line state:
Connected
Connection time:
2 days, 22:27:19
Downstream:
17.55 Mbps
Upstream:
1.053 Mbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.5 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
3.6 dB / 7.0 dB
Line attenuation (Down/Up):
20.9 dB / 11.1 dB
Output power (Down/Up):
20.1 dBm / 12.6 dBm
FEC Events (Down/Up):
8822810 / 44550
CRC Events (Down/Up):
121 / 59570
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
1805 / 164783
Error Seconds (Local/Remote):
87 / 45535

Hi,
Thanks for replying.
line test was fine.
Here are results from bt speed tester
1. Best Effort Test: -provides background information.
Download Speed
15.57 Mbps
0 Mbps
21 Mbps
Max Achievable Speed
Download speedachieved during the test was - 15.57 Mbps
For your connection, the acceptable range of speeds is 4 Mbps-21 Mbps.
IP Profile for your line is - 16.12 Mbps
2. Upstream Test: -provides background information.
Upload Speed
0.83 Mbps
0 Mbps
0.83 Mbps
Max Achievable Speed
Upload speed achieved during the test was - 0.83Mbps
Additional Information:
Upstream Rate IP profile on your line is - 0.83 Mbps

Internet connection tempermental and slow

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