Pages dont load &or take toooo Long

Question

The MAC below is 4 months old.
For what I do guy at store told me this is adequate
M Lion 10.8.2
I use a DSL line with a 2701 hg gateway router.
Speed test tells me I ma at about 1.2
It takes up to 3 minutes to load certain pages such as Yahoo finance some never load
The 1st click it starts to load and sits there with the blue bar 1/2 way loaded.
If I reload the page its quicker and the 3rd time it loads.
This really *****.
I have been on the phone with tech support and they say no problem.
I got rid of a 2000 Dell running W98 and it was quicker than this.
In 10 years I never had a problem with the Dell
I am pretty fed up and looking for some direction b4 I put it on ebay
Model Name:          iMac
  Model Identifier:          iMac12,1
  Processor Name:          Intel Core i5
  Processor Speed:          2.5 GHz
  Number of Processors:          1
  Total Number of Cores:          4
  L2 Cache (per Core):          256 KB
  L3 Cache:          6 MB
  Memory:          4 GB
HD 5 G
  Boot ROM Version:          IM121.0047.B1F
  SMC Version (system):          1.71f22
<Personal Information Edited by Host>

Answer 1

Safari 5.0.1 or later: Slow or partial webpage loading, or webpage cannot be found