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OS X - Operating System General OS operation information and support

OS 10.5 - High CPU usage when connecting to the internet

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Member Since: Jun 22, 2007
Posts: 23
iBook2007 is on a distinguished road

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Hello, I have a eMac with the following specifications:

eMac Education Edition:
Processor: 1.25 GHz PowerPC Processor
Hard Drive: 40 GB Capacity
Optical Drive: CD-RW/DVD Combo Drive
Operating System: OSX 10.5

Now I consider this a pretty decent system, it is no where near as fast as the Intel or G5 Macs, but it should be enough to surf the web and edit office documents. However, since this is an education edition, it did not come with a modem, so I ordered Apple’s USB Modem, and that is where the problem begins. When I am offline, the performance is generally quite responsive even on leopard, but whenever I connect to the internet, processor load jumps to over 60%, and the operating system becomes noticeably more sluggish. Now this problem existed with me before I installed Leopard, and still had Tiger, so I know installing Leopard is not to blame. Furthermore, I have a Panther, G3 500, 572 mb of SDRAM, and when it connects to the internet, its load is smaller than the load on my much faster eMac. When checking the Activity Monitor, the process kernel_task seems to be responsible, and uses 50-60% of CPU processing power. So I am wondering if anyone knows what could be the problem, if there is even a problem at all. And if so, what can I do to make decrease it load on my G4. Thanks.
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Member Since: Jun 22, 2007
Posts: 23
iBook2007 is on a distinguished road

iBook2007 is offline
Could it be the fact, that the Apple USB modem is a softmodem?
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