But we do know what we're talking about, Gytyy! OP. You just need to make the Flux Capacitor move at a faster rate so your Photosynthesis cell can Spontaneously Combust and then get a new computer with a 15 Kb. Memory card to increase processing. jk, it could be because of your connection stuff. Try to see if you time out on your own server.
question: do you see the lag icon before you time out
re-install lan drivers or wifi drivers, check to see if it happens on lan, wifi, or both, then if thats the case, try on another computer in the house, if it keeps happening after that, the router is the problem and not the PC
was it the same install of blockland with the same client add-ons? (regarding the different pc)
was the network through the same isp