Internet slower than comparable computer in same LAN (Clean install with XP SP3)?

There may be different TCP settings for XP.

Get this and run it and click the "Optimized" settings radio button for the network adapter you use.

http://www.speedguide.net/downloads.php

Also run a WAN speed test and compare it on different computers as well as your advertised speed from your ISP

http://www.speedtest.net/

Be sure you have the latest drivers for your network controller. DO a scan here, then download them from your manufacturer's website

http://driveragent.com/scan_step1.php?r=4

Three possibilities that come immediately to mind:

1. You have different connections. For example, you have a wireless network and he is physically closer to the wireless router than you are. Or he has an ethernet connection to the router, while you plug into with a USB device.

2. You have different bandwidth demands. Say your ISP gives your home 2 mbps. You router doesn't allocate that bandwidth as "1 mpbs per computer". It allocates bandwidth according to demand. If your brother is downloading videos, and running a file sharing program, and sending pictures to his friends, while you are just trying to read your e-mail, you'll get the short end of the stick.

3. I had a problem with my internet connection once that I never did figure out. It took exceedingly long for it to DNS lookups (meaning, when I provided an address like "www.yahoo.com", it took a long time for it to figure out that it needed to go to "72.28.123.41", or whatever. I don't know what caused it, but I removed my internet connection and re-added it, and the problem went away.

I think you should go to DSLreports.com, and do a speed test. Then, ask you brother to shut his computer down for a minute, and do the speed test again. If you get a much better speed with your brother's computer off, then it's your brother's fault, not your computer's.

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well do both machines have the same specs and the same speed ethernet card? are they both connected through the same type of Cat-5 cable or is one maybe on cat-5e? are either of them connected through a low through-put hub or switch?

ermm hello u dident properly formatt it to properly format it u need to F-Disk it and totally wipe it clean then make a new pentaration then put windows xp on btw u can upgrade ur intrnet speed :D

Maybe phishing filter and antivirus are different... these have a toll in speed performance.

Not sure. but have you tried switching ports that you are plugged into?

If you are wireless, is your wireless set to G mode instead of B mode?