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In terms of speed I'm sure it is fast enough. However, if you want to do anything more than host a few static pages and files I think you will find it lacks the features necessary for a fully fledged website. For example, I don't think they offer DNS services or database options. My recommendation would be to look at TJR Networks or Myacen. Both are good hosting providers with good prices. If you need 24/7 support go with the later, if a small time delay doesn't bother you, then save your money and go with the former. 🙂

I personally would never use .Mac to host a website.
 
Jazzy Host

This is a cheaper option than Small Orange or Fat Cow. 5GB space, 50GB data transfer and all the goodies for 6.00 a month, if paid by the year.

.Mac is for Grandmas to post iPhoto album of their grandkids. 😉
 
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