It is interesting that a monitor without power previntes the mac system slowdown. This sounds as though the mac does a form of a ping to query from time to time what is attached. If it doesn't recieve a return signal instantly it does it again and/or waits for a determined time before allowing an application to resume activity.
If this is the case, any return signal is not being generated by the monitor but the circuit is made at the socket and passes it back to the mac. It would then in principle be possible to find the wire pairs in the vga socket and make the return circuit absent a monitor.
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