Originally Posted by sirinsidiator
It's not mentioned here, but on Gitter Chip told us that the saved variables are written in a background thread, so there should not be any stutter or performance issue, unless you use a single core CPU or limit ESO to one core.
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Actual writing is a different stage of the process than serialization. In order to do it while the addon system is running, Lua cannot be allowed to execute any code or you'll have the possibility of data corruption. This means it needs to be done with the UI thread or at least lock it meanwhile. Locking the UI thread either way means the UI will be unresponsive for the duration and when that happens, it ties up the rendering engine as well. It's a cascading effect.
Just because something runs on a different thread doesn't mean thread locking doesn't exist, it's a necessity in certain applications.