XOR gives us randomness in normal IP space. So we can expect a random IP address for 2 close nodes in XOR space. Thus when a chunk travels from vault to your PC the route will be random in IP space.
IP space though has its densities and the higher the density then higher the probability that 2 close nodes will fall within that space. This also translates into more often the latency for routes being lower if your IP address density in your location is higher.
For instance lets say that there is only two physical locations for nodes a long distance apart. “A” & “B”. Now location “A” has 1,000,000 PCs with their corresponding IP address and location “B” has only 1,000 PC’s with their corresponding IP address.
Now for random IP addresses in routes then randomness says that any one hop will have a node occurring 1 in 1,000 hops located at location “B”. So for routes with 20 hops probability say only 1 in 50 routes will hop into location “B” when requester is in location “A”. If the requester is in location “B” then there is always two or more hops across the void (the request and delivery). Big difference in chunk delivery latency.
We can see from this extreme example that if there is one region in the world which has a significantly higher density of nodes then their latency will be lower than for a region with lower density.
Australia is only far from north America, it is a lot lot closer to the ASIA region and we actually have links that can split off in a few Asian countries. Just at the moment 99.9% of our traffic is destined for the USA with the highest density of Servers/hosting companies.
ASIA has majority of people with PCs in the world followed by Europe, then North America, followed by the rest of the world.
If people in Asia adopt SAFE then its very likely that Australia being part of Asia (links) will have good chunk latency times compared with Europe and America will have the worse out of the 3 major regions.
Although initially it seems that the highest density of nodes will occur in the USA and west europe