My 2007 mac pro has a slow internet connection with lion

Hi:
I've been dealing with a severely slow internet connection with my 2007 mac pro - dual quad core. I have os 10.7.3. I use wifi.
Typically, I'll experience difficulty loading websites completely. Certain sites have a 90% failure rate to load most elements. Other sites operate quickly from time to time. Often, a site will simply fail to load at all. My cable company cannot find anything wrong with my connection and other, newer devices don't have a problem loading sites. It seems the issue is most likely related to my computer.
Interestingly, I can usually "jump-start" the connection by turning my wifi connection off and on and this will (temporarily) allow me to get an image or video to download.
Any ideas?
Thank you for your time.

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For whatever reason you don't have the Yosemite version of Disk Utility which is 13. I suggest you reinstall Yosemite.
Reinstalling OS X Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Continue button.
Download and install the 10.10.1 update.
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Check that you have the current version of Disk Utility.

Mac Pro Late 2008 Slow Internet

Hi,
I have a problem with my Mac Pro Late 2008, version 3.1.
I Have an High Speed internet connection 60mbps download and 10 mbps Upload.
I Have a Gigabit Routeur with a Gigabit Switch, and a proper cable setup made by a professional.
So here's the problem.
My Mac Pro cannot not acheive to get the 60 mbps speed in any way. the max that i can get is 20 mbps.
Here's what i tried :
With the same ethernet wire, i plug in 5 differents mac with different versions of OSX (2 Macbook Pro Retine, MacBook Pro 15", Mac Mini, MacBook Pro 13"), they all get the 60 MBPS speed.
With the same wire, i tried the 2 differents network plug on the mac pro.
All those test have been made with only this mac pro plugged into the Switch, so no other computer are using the Bandwidth. And the routeur reset to be sure it will give a new IP adress and forget all the other computer and devices.
I've tried different DNS on my mac pro, Google, OpenDNS (paid subscription), My internet provider.
I've reset the PRAM of my mac Pro
I've reset the SMS of my Mac Pro
I've done the test with 10.5.x, 10.6.x, 10.7.x, 10.8.x and 10.9.x
None of those procedure worked.
The only way that i finally get to have the 60MBPS is to plug the mac directly to the Cable Modem of my provider, without any routeur or switch, and you can understand, that's not a livable option.
So I don't what else to do, is anyone ad the same problem?
Here's the Specs :
Nom du modèle :          Mac Pro
Identifiant du modèle :          MacPro3,1
Nom du processeur :          Quad-Core Intel Xeon
Vitesse du processeur :          3 GHz
Nombre de processeurs :          2
Nombre total de cœurs :          8
Cache de niveau 2 (par processeur) :          12 Mo
Mémoire :          18 Go
Vitesse du bus :          1,6 GHz
Version de la ROM de démarrage :          MP31.006C.B05
Version SMC (système) :          1.25f4
Numéro de série (système) :          NQ******200
UUID du matériel :          ****
<Edited By Host>

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My local connection seem to run at gigabit speed. If i copy a very large file from my Mac pro to my MacMini Server, it take the same time as if i copy the same file from my macbook pro retina (wired connection of course, thunderbolt to ethernet adapater).
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If you haven't got another Mac with a fast Internet connection, you can only download the iLife applications with the slow connection

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I have what I would consider a difficult question. I called Apple Care and after she spoke to a senior advisor,the representative ended up saying it wasn't possible.
Having said that, I'm sure this is not a difficult question for people with networking expertise.
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However, in iTunes on my G4 I would like to use iTunes DJ.
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So my question is about Internet sharing itself. Is it not a fully featured ad-hoc network? Does it only provide browsing capabilities and the ability to browse networked computers, but NOT devices such as an iPhone? I don't see the difference; my iPhone is on the same network as the computers, so why is there no communication between it and computers that gain their Internet connection through another computer?
I really hope someone out there who is an expert in networking can help me out with this. Or if it truly is impossible, if someone could explain to me why that is the case, I would also appreciate it.
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I have a 1Gbps (1000Mbps) internet connection from my ISP, using the internet speed testing service provided by local authorities, my internet download speed is shown to be at least 250Mbps (close to the max limit of the test) when my iMac directly connected to my wall ethernet socket.
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I didn't realize we're missing so many functions in airport utility 6.0.
Anyways, upon reading your advice, I installed Airport utility 5.6 on mountain lion and checked the link speed settings.    Apparently it was automatically set to 100Mbps when connected to my cable modem.
Strangely, if I manually change the link speed to 1000Mbps full duplex, Time Capsule would report an "ethernet unplugged" error along with the consequential "internet connections" and "no DNS servers" error.   Since my ISP has been supporting consumer 1Gbps internet for a few years now, and since I am able to get an over-100Mbps actual link speed with directly connection to my cable modem, I am certain that my cable modem connection supports 1000Mbps local connections.
Many thanks for your incredibly detailed reply. All the information in your solution is correct, and while it did not directly solve my problem, it would have taken my a lot longer to figure out the issue without the information you provided.
I didn't realize we're missing so much functionalities in airport utility 6.0.
Anyways, upon reading your advise, I installed Airport utility 5.6 on mountain lion and checked the link speed settings.    Apparently it was automatically set to 100Mbps when connected to my cable modem.
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After NUMEROUS tests, I discovered the problem is down to a FAULTY ETHERNET CABLE, which I did not use for my Mac -> cable modem direct connection. This was why I was able to get gigabit ethernet speed with a direct connection but not through time capsule!
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New ethernet cable direct connection:-
Wired connection through Time Capsule:-
Wireless Connection (wireless-n 5GHz three streem 450Mbps transmit rate) through Time Capsule:-
I'm a bit surprised that a damaged cable resulted in a lower link speed rather than no connection at all.
Also, while the throughput of Time Capsule can't really match the link speed of the direct connection, I'd say it's not shabby at all.
Thanks again LaPastenague for your solutions.

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Apple Support does not participate in ASC nor do they read these threads.
An AirPort Extreme is not a panacea for the phenomenon you describe, and whatever the problem is, it is not common enough to draw any conclusions. The number of variables that affect a wireless network is so large that a solution to your complaint from Apple Support will be elusive. Read this for one example: New Panasonic blueray player won't connect to my network if my iMac is running. Crazy things like that can drive you up a wall.
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Who I shuttle down IMac The connection for my IPad and Iphone works fine.
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My 2007 mac pro has a slow internet connection with lion

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