The new MacBook Air has Wi-Fi issues -- so say owners in Apple's support community. This wouldn't be the first time that a new Apple product had Wi-Fi hiccups.
The MTU handling in OS X Mountain Lion may not work with the configuration for some Web servers, and might need to be adjusted.
In addition to using the system preferences, you can adjust Wi-Fi network configuration in OS X via Terminal.
Adjustments to certificate handling for some captive network setups may help overcome network access errors or blocks that prevent e-mail or Web access.
Adjusting some Flash and system settings may help when Flash Web content hangs or shows choppy performance.
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Users may find that a second internal or external hard drive suddenly no longer mounts.
Tip: Increase Internet speed by manipulating MTU size
Yet more tips for boosting Safari's performance.
Tips for boosting the performance of Apple's Web browser.