Deconstruct Lag in MP

[Kaizokoo]

Suddenly in MP my friend and I had deconstruct lag where when we tried to delete belts or anything else in a row it would skip 1-3 tiles. Before it used to be normal like in singleplayer, smooth and instant.

So we deactivated all mods and it still lagged.

Then we deleted the Factorio folder in %appdata%\Roaming

Loaded the game into MP and now there's no deconstruct lag at all.
Deleting belts in a line is exactly like in singleplayer.