It also happens for me on whichever wireless adapter driver I use. However, using this computer on a friends wifi the problems persists while using another computer on my wifi the problem disappears. I’ve heard that you should make sure that in wireless adapter setting --> properties --> configure --> power management you should make sure “Allow the computer to turn off this device to save power” should be unticked.
Also, try updating your driver to the one you manually installed from your manufacturer’s website (not always what your computer recommends).
Neither of these have worked for me, but I’ve heard they worked for some people.
I have no idea what to try next.
@Nevov this problem is not about deca’s servers or about lag in general. It is a specific problem that affects people across many games. I feel like we could get more help if this were moved out (if you even can; idk how the forum works) of people whining about decas servers that we can’t change, not that that isn’t an issue.