As you have identified yourself there can be various factors involved in job markets, and Perth/WA is not isolated from that, ie.
. Mining Industry is allegedly absorbing many people to high paying work.
. But then right now and for forseeable few months there is an energy shortage owing to a Gas supply explosion industries are being restricted.
. There is talk of flow on effects of that.
. Coupled with all, petrol prices hitting stratospheric highs and recent interest rates increases all add to people tightening their belts on spending.

Thus average time, wages, saturation are all variables too and life goes on.
You go there and find what work you can or you decide not to go!