I'm not sure I follow the bit about convincing myself. Going back to square one again with a setTimout/event loop renders much of the use of workers pointless,

I'm not sure I follow the bit about convincing myself. Going back to square one again with a setTimout/event loop renders much of the use of workers pointless, you are stuck back at the same restrictions as main thread JavaScript. I agree pre-emption would allow this without shared data structures. It just seems that the solution we will be given in the end will be a shared model. http://lars-t-hansen.github.io/ecmascript_sharedmem/shmem.html http://lars-t-hansen.github.io/ecmascript_sharedmem/shmem.ht...