Why Does My Mac Download So Slow

Why is my computer running so slow

The following usually works on both Tiger and Leopard:
(First, if yours is an Intel Mac, check that Safari is not running in Rosetta, which is enough to slow it to a crawl.)
Adding DNS codes to your Network Settings, should gives good results in terms of speed-up:
Open System Preferences/Network. Double click on your connection type, or select it in the drop-down menu. Click on TCP/IP and in the box marked 'DNS Servers' enter the following two numbers:
208.67.222.222
208.67.220.220
(An explanation of why that is both safe and a good idea can be read here: http://www.labnol.org/internet/tools/opendsn-what-is-opendns-why-required-2/2587 / )
Whilst in System Preferences/Network you should also turn off 'IPv6' in your preference pane, as otherwise you may not get the full speed benefit (the DNS resolver will default to making SRV queries). If you want to know what IPv6 is:
This is Apple's guidance on iPv6:
http://docs.info.apple.com/article.html?path=Mac/10.5/en/8708.html
Click on Apply Now and close the window.
Restart Safari, and repair permissions.
If that didn't do it, then try this as well:
Empty Safari's cache (from the Safari menu), then close Safari.
Go to Home/Library/Safari and delete the following files:
form values
download.plist
Then go to Home/Library/Preferences and delete
com.apple.Safari.plist
Repair permissions (in Disk Utility).
Start up Safari again, and things should have improved.

Follow these steps to do so: Shut down your Mac. Press the power button to turn on your Mac, and then immediately press and hold D on the keyboard. When you see the screen that asks you to select a language, release the D key. Select a language, and then wait for the diagnostic tool to run. When I bought my iMac in 2008, It could download files at about 1mb/sec. Now, when I try to download any file from safari, it starts at about 500kb, and then continually gets slower, until it gets to less than 75kb. I checked Activity monitor, and I have enough Sys memory, but it wont get any faster.

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Apr 12, 2009 12:48 AM