Internet connection problems...

Hi there...
Not sure if this is the right forum, but help needed as I am close to committing murder!
I have a G5 imac and connected to the net via cable as I have no Airport. Had all the bits and bobs checked, speed test (top of the range allegedly) and was upgraded to the fibre optic thingy a few weeks back, but for some reason the whole shebang is slower than dial up used to be.
As for watching YouTube clips or BBC iPlayer, well that is a no no.
Even typing things like this can be a pain.
I live in east London, so it's not as if I am in the Highlands of Scotland and connectivity is the problem.
Both my kids have lap tops and they work perfectly.
I was wondering if there is a settings problem that I may not be aware of?
Any help will be most welcome.
Cheers in advance.

Westlands2011 said:

Even typing things like this can be a pain.

Click to expand...

This is the one clue that the problem may not be internet related.

When was the last time:

- you repaired permissions?
- how full is your hard drive?
- how much ram does your computer have?
- what OS version are you running?

- Nick