iMac Genius Bar appointments?

So I have an iMac that's like 10 months and to be fair it's been slow and sluggish for the get go and I just assumed it was a slowish processor (it's was the middle priced model in the 21.5" model with no upgrades) and basically haven't used it hardly at all and wrote it off as a bad investment.

After moaning to a friend recently that it rubbish and I really wish I hadn't bought it he suggested taking it to the Apple Store as clearly there is something wrong with it. Which brings me to booking in with the Genius Bar. For some reasons when I select any store, Genius Bar and then select my product as a Mac its say there are no appointments available? What's the deal with that? Do you have to book any appointments another way?

 

London. Just to confirm if I select another device (iPhone) there are appointments available.

 

Okay maybe its an App thing. If I go through the same process on the browser it starts to ask me more questions and basically wants me to make a support call. I'll try that.

 

Humm, surely Apple isn't selling a computer that takes a full minute to open Safari or Music, etc. BTW, I get that its a standard hard drive and these are slower than SSD, but with all the PC's I have ever had (Windows ones) they've always been those types of drives as its not been an issue.