Mac network performance issue

I've just had a new ISP hookup. My WiFi is blazing fast. But my Mac network speed is slowwwww.
Speedtest.net just reported:
Ping: 253ms
Download: 1.12Mbps
Upload: 0.43 Mbps
On my iPad via Wifi, I get:
Ping: 19ms
Download: 13.88Mbps
Upload: 0.90Mbps
My Mac I think dates back to about 2005/6, even though you would think 2008 based on sites like everymac.com. But I bought it long before 2008.
The only modification I've made to it has been to bump it from 2GB to 4GB memory. That slowed down the bootup, but not ridiculously.
How can I diagnose fix this network issue?

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, or by corruption of certain system caches. 
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output and  Wi-Fi on certain iMacs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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    Frankly the only posts I found even close seemed to be about making a lone Mac work on an existing PC Workgroup Network. This is the Flip Side, One Lone PC is a world of Mac's. I have to admit my PC skills are rusty. I was a PC Guy that got "Converted" used to know Lots of the in's & out's of the PC's, but that was about 4 Operating Systems Ago (2000 & XP-Pro) I find I now feel like a Newbie again plodding along in the new MS OS again.
    Being able to see the other machines would be a plus, connecting to all the drives & my NAS would be Great, but the Screen Sharing would be my Top Wish (If it's even possible) My various Mac's often do work that is LONG Running (sa Rendering Long Video Files, etc.) that can run on their own for long periods and Occasionally Need just a Nudge from me to get started again. This is why the Screen Share is a Big Deal for me. Do some work, Check in on #1, start it's next process, log out, check on #2, move some files and begin a new Process, log out, check on #3, then go back to work.... and I'm Not Always at my desk, so being able to quickly Pop in & out of each machine is a BIG PLUS for me.
    I tried some Remote Desktop Software a while back when I was trying to connect my iPad to my Home Mac Network from Outside my home and discovered I knew Less than Squat about that. Tried & Failed to get software to work even after several emails with the developer of the APP. I couldn't even understand what he was talking about (and I have a CS Degree ??... OK an Old One on Main Frames, not PC's but I'm no Dummy and he was talking WAY over my head) So I pretty much gave up on that option.
    If you have the answers? Appreciate the Info,
    Even if all you have is links to other posts that have what I'm looking for? Great Too
    Thanks
    Products
    Time Capsule, Mac OS X (10.6.8)
    Apple TV (2nd generation)
    iPad, iOS 5.1.1
    MacBook Pro, Mac OS X (10.6.8)
    Mac mini, Mac OS X (10.7.4)
    Toshiba-PC, Windows 7

    Close your iTunes,
    Go to command Prompt -
    (Win 7/Vista) - START>PROGRAMS>ACCESSORIES, right mouse click "Command Prompt", choose "Run as Administrator".
    (Win XP SP2 n above) - START>PROGRAMS>ACCESSORIES>Command Prompt
    In the "Command Prompt" screen, type in
    netsh winsock reset
    Hit "ENTER" key
    Restart your computer.
    If you do get a prompt after restart windows to remap LSP, just click NO.
    Now launch your iTunes and see if it is working now.
    If you are still having these type of problems after trying the winsock reset, refer to this article to identify which software in your system is inserting LSP:
    Apple software on Windows: May see performance issues and blank iTunes Store
    http://support.apple.com/kb/TS4123?viewlocale=en_US

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