Re: Virgin Unlimited Sim tethered to laptop. Average mbps 55+ but why lagging while gaming?!
I believe (though not 100% sure) that your connection gets routed via the operator's home country. So if you're in Spain, your data has an extra 500-1000 miles (depending on where you are) to travel in each direction before it gets to where it's meant to be going. That's probably going to be the main source of your latency, although as apcyberax says, mobiles have worse latency than landlines anyway