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The entire WoW Lua API is single-threaded, there is no asynchronous calls for anything. While your code is running, no other Lua code is going to run, and your code is not getting interrupted for something else to run (sort of, if you call something that triggers an event, the event handler might run as part of that function call, and only return control to you once its done - all on the same thread)
In fact the UI even runs on the main game thread, to ensure relative integrity of game data while its running - of course that also means that slow addons tank performance, which they certainly can.
You didn't really explain your problem very much but directly jumped onto threading - which is just not the case. So maybe with some explanation, we can shed some light whats going on.
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