(follow up and more clear) very sluggish ethernet

Thank you everyone for the comments, but perhaps I wasn't as clear as I meant to be. The problem isn't because of network limitations. Here is my specific scenario: One PC and my PowerBook, both with gigabit (irrelevant), when hooked Directly to each other, no LAN involved, will transfer data slowly when it should have (near) full gigabit data rates. WHEN I use a 10/100 NIC on the PC connected to the PowerBook, I can obtain (near) full 100Mbps. I have even replaced the motherboard (onboard gigabit nic) to make sure my pc wasnt the issue.
Further, when the two computers are hooked into my school's lan, the pc will load web pages very quickly compared to my powerbook in which there will be a very noticeable wait time. Google even takes a good time to load. This isn't just me perceiving it to be slow. It's very obvious.

Thank you everyone for the comments, but perhaps I wasn't as clear as I meant to be. The problem isn't because of network limitations. Here is my specific scenario: One PC and my PowerBook, both with gigabit (irrelevant), when hooked Directly to each other, no LAN involved, will transfer data slowly when it should have (near) full gigabit data rates. WHEN I use a 10/100 NIC on the PC connected to the PowerBook, I can obtain (near) full 100Mbps. I have even replaced the motherboard (onboard gigabit nic) to make sure my pc wasnt the issue.
Further, when the two computers are hooked into my school's lan, the pc will load web pages very quickly compared to my powerbook in which there will be a very noticeable wait time. Google even takes a good time to load. This isn't just me perceiving it to be slow. It's very obvious.

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