A new study from network benchmarking giant Ookla, which collects data from consumers via their popular broadband and mobile Speedtest.net service, has done a deep dive to expose the often hidden ways in which travel eSIMs work and the negative performance impacts (particularly on mobile broadband speeds and latency) this can sometimes have. However, the route your eSIM traffic must travel to reach the internet isn’t as dependent upon your physical roaming location as you might think, with the data packets often being sent back through a provider’s core network first and that can be based in another country – sometimes even halfway around the world.