That's not surprising at all, for two reasons:What fascinates me is there are people who have like 4GB RAM and complain - like me - and people who have 16GB RAM and complain on the slowdown
RAM has nothing to do with speed unless you don't have enough and a process starts swapping out to the hard drive.
EU4 uses a 32-bit executable so it can only address up to 3GB before crashing, and in practice it uses much less than that unless you run a really heavy mod.