If you are experiencing slow downloads from the App Store or iTunes Store (movies, music, etc.) to your Mac, iPhone, iPod touch, iPad or Apple TV a simple setting may be to blame.
Switching your DNS servers to those offered by Google or OpenDNS can significantly boost the speed at which iOS devices can access YouTube, but may cause slowness when downloading files from the iTunes Store or App Store. As theorized by Joe Maller:
“iTunes’ video content is delivered by Akamai who has distributed massive datastores around the world so those large files originate from nearby servers and spend less time getting switched around the network. Akamai somehow uses our DNS routing to determine our location. If Google DNS or OpenDNS routes everyone to Akamai the same way, then those Akamai nodes and the pipes leading to them get overwhelmed.”
However, some users have reported the opposite to be true; i.e. using Google’s DNS servers or OpenDNS servers results in faster access to the App Store, iTunes, YouTube, Netflix, etc. As such, it’s best to play with your DNS servers and find an option that works in your location and with your ISP.
You can usually find your ISPs DNS settings by going to your ISP’s website and locating a “DNS help” section, or typing the name of your ISP and the term “DNS” into Google, e.g. “comcast DNS.” For Comcast, use this page; many other ISPs’ DNS servers are listed here.
To change DNS servers, follow these instructions for iOS devices (iPhone, iPod touch, iPad):
- Tap Settings
- Tap Wi-Fi on the left-hand side
- Tap the blue arrow next to your current Wi-Fi network
- Tap the “DNS” field and enter the DNS servers
For the Mac:
- Go to System Preferences -> Network
- Click on the connection you are using now.
- Click Advanced
- Switch to DNS tab.
- Click the + sign under DNS servers and add the DNS servers
For Apple TV:
Navigate to Settings > General > Network > Configure Wi-Fi and find the DNS setting.