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Several nights ago, I noticed that my home wifi network seemed really slow on my Macbook Air (mid-2011). I was seemingly capped at 12KB/s for downloads, while I was able to upload pretty consistently around 45KB/s. My iMac is working better, still a bit slow, but far better than the Air. This happens at several networks using different routers (first edition Time Capsule, Belkin 802.11G router) and seems a little better on another network (an Airport Extreme Base Station) but that seems to be capped around 35KB/s down. I have tried:

  • Rebooting
  • Rolling back to a previous version of AirPort Utility
  • Disabling the firewall
  • Renewing DHCP
  • Flashing the PRAM
  • Changing DNS servers

without luck. Latency is also very high (about 4 seconds for a ping when I tested it) to the point where many connections simply timeout.

Details that might be useful:

  • 11" MacBook Air, Mid-2011 with 1.6 i5, 2GB RAM, 64GB SSD
  • OS X 10.7.3
  • Filevault 2 is enabled
  • 35GB free disk space
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Welcome to Ask Different. You should limit the scope of your question to one single subject. If you have multiple questions it's fine to create a separate topic for them. –  Gerry Apr 18 '12 at 8:02
    
Thanks for the advice! Edited to fix that. –  Kellen Fujimoto Apr 19 '12 at 6:10

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