Lag spikes

Every time theres a lag spike in game (also after crafting or going afk for a minute or two) I seem to get this ungodly lag spike that lasts for hours when I could play on the highest graphics before the spike and after I cant even play on the lowest. Anyone have any ideas? Anyone else having this problem ?

[editline]2nd November 2013[/editline]

Anyone have this problem so I know im not the only one at least?

[editline]2nd November 2013[/editline]

Anyone have this problem so I know im not the only one at least?