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Sometimes changing MTU settings resolve slow speed issues.
Steps for Ethernet in Mac OS X 10.5.x
1. From the Apple menu, choose System Preferences.
2. Click Network.
3. In the left sidebar, select "Built-in Ethernet 1".
4. If you see a lock icon in the bottom left corner, click the lock icon and enter your administrator password.
5. Click the "Advanced..." button.
6. Click the Ethernet tab.
7. From the Configure: pop-up menu, choose "Manually".
8. From the MTU pop-up menu, choose "Custom".
9. Enter your desired setting (72 to 9000). Some ISPs may have a specific suggested MTU value. If you're changing it without a specific recommendation, make incremental changes (such as 1500 to 1400 to 1300, and so forth).
10. Click OK, then click Apply to save your changes.
Important: Changes made to your Ethernet MTU settings will be persistent, meaning the new values will still be used after you restart your computer.
Steps for AirPort in Mac OS X 10.5.x
1. From the Apple menu, choose System Preferences.
2. Click Network.
3. From the Show pop-up menu, choose AirPort.
4. Click the Ethernet tab.
5. From the Configure pop-up menu, choose Manually.
6. From the MTU pop-up menu, choose Custom.
7. In the field to the right of Custom, enter your new setting. Some ISPs may have a specific suggested MTU value. If you're changing it without a specific recommendation, make incremental changes (such as 1500 to 1400 to 1300, and so forth).
Important: Changes made to your Ethernet MTU settings will be persistent, meaning the new values will still be used after you restart your computer.
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