Why is safari 5 so slow when loading media rich content?

I have G5 1.8 GHZ just before they upgraded to the 1.9.  I recently upgraded the RAM to 2 GB in order to download snow leopard so that I could use my ipad 2 and ipod.  After installing and updating, to
  System Version:          Mac OS X 10.6.8 (10K549)
  Kernel Version:          Darwin 10.8.0
I've also updated to the most recent version of Safari 5 and Adobe Flash 11.  I use a cable modem/wireless router Motorola SB901 model.
Safari pens a page say cnn, loading half the content usually text and borders/headers very quickly, but severly lags when loading pictures, and videos. Once the player starts the video actually buffers pretty quickly.
This has become a major problem and setback as now we can use our new devices but our home internet experience is horrible.
Other devices such as the ipad or even my xbox work just fine streaming content quickly or gaming.
I've done the cache empty, history, clean and the like. Changed the DNS server as recommended.  Unclicked the enable plug in button.  All to no avail.
I am on a home secured network so bandwith is not an issue.
Please help!

sorry imac 5
  Model Name:          iMac
  Model Identifier:          iMac5,2
  Processor Name:          Intel Core 2 Duo
  Processor Speed:          1.83 GHz
  Number Of Processors:          1
  Total Number Of Cores:          2
  L2 Cache:          2 MB
  Memory:          2 GB
  Bus Speed:          667 MHz

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