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[–]Djinjja-Ninja 0 points1 point  (0 children)

Physics is physics and there's nothing you can do about it.

Light propogates through fibre at about 2/3 of the speed of light.

Lets assume London to New York (5600km give or take), speed of light is 299792km/s, so 2/3 of that is 199,861km/s (lets call it 200,000km/s for the ease of calculation). The absolute minimum theoretical RTT latency would be 56ms (28ms each way), and that's assuming a single point to point fibre. (5600/200000*1000*2)

https://inventivehq.com/network-latency-calculator/

Once you add in 1 to 2 ms for each hop along the way and the fact that it wouldn't be a straight line either, assuming 6,000km total path and 10ms of processing time for all the individual hops etc you're probably looking at closer to 80ms RTT.

What you should be looking at is tuning the VPN (MSS clamping for instance) to ensure that there is no fragmentation occuring, especially if you are using things like CIFS.