Help with understanding FarCry site

[yummii]

Hi,

I have a site called AussieROO.com and it's been developed using
FarCry 4.0.

I have a few questions to understand my site better:

1. Currently the site is being hosted overseas and I want to bring the
hosting to Australia - Are there any recommendations and is it
possible to host FarCry 4.0 on a shared server environment?
2. How difficult is it to upgrade from FarCry 4.0 to the latest
version? How much time and development effort is involved? I'm
thinking of rebuilding the site and don't want to take this step
unless it's really necessary in order to being the site back to
Australia.
3. What Web Hosts are recommended for FarCry 4.0 in Australia? The
site is quite sluggish at the moment and I'm worried that it's going
to get worse if it gets hosted in Australia on a shared environment.

Any assistance is greatly appreciated.

Cheers,
Yummii