Sure.
1) Recording/observing the precise state of all matter and energy at every part of the universe at precisely the same instant.
a) Access - recording the precise state of all matter/energy at the centre of the Earth; the centre of a black hole
b) Timing - measuring anything takes time, how do you measure the precise state of all matter and energy in a way that allows you to build a picture of everything at *exactly the same point in time*.
2) Slower than real time
a) Every electron whizzing around your simulation is simulating something, but it also needs to simulate itself. It can't do two jobs at once (simulate the thing and simulate itself). Ergo you need another pass (with another bunch of electrons) to simulate the movement of the first electron (that was simulating the other thing) and so on and so on.
Note here that this isn't a problem of recursion, but merely a problem of speed/inability to multi-task. The device needs to simulate its own constituent parts, but it can't do that at the same time as simulating the other things with its constituent parts, so it has to use multiple passes.
As I said in the another thread, the universe is the quickest and most accurate simulation of itself, because all parts are just doing one job.
If a part of that universe has to simulate the whole universe, then by definition they must be slower at doing so than the universe itself. Ergo slower than real-time simulation.
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