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At home, we have a router. From router goes the internet connection into the desktop PC (Windows 7) and Macbook Pro.

The problem is, that on Mac OS is incredibly slow internet connection - is not possible to use the laptop for surfing on the internet. The same as for WiFi as for cable.

On the PC with Windows 7 is working the internet connection properly.

Is there any tool for testing, if on my Mac is a virus or just something, what slowing down the internet connection?

THank you in advance.

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Are you saying that the internet is slow only over WiFi? Have you tried plugging the MacBook into the router directly with an ethernet cable? –  thornomad Nov 20 '12 at 21:08
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1 Answer

Try checking your speed at speedtest.net to compare the difference in Internet speeds between each computer.

You can also try using the Network Diagnotic tool:

  1. Open System Preferences
  2. Select Network
  3. Click the button Assist Me
  4. Select Diagnostics to troubleshoot your problem
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2 things I'd like to add: a) Look at the interface with ifconfig, are any values of errors, dropped, overrun, frame carrier non-zero? b) Look at the traffic with wireshark. Are there excessive DNS lookups? Checksum errors? As asked above, can you connect the macbook to the router via cable? –  ott-- Nov 23 '12 at 7:52
    
Hey guys, thank you for your replies, I am going to try it. can you connect the macbook to the router via cable? -> yes, I can. And if I do it, the internet connection is working correctly, without any problem. Looks like a problem is between macbook and router. –  user984621 Nov 23 '12 at 11:37
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