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I try to calculate the following eigenvalues of a matrix of N=5 10^3 X5 10^3 and representing it using Listplot as follow

PL = Eigenvalues[{N[H], N[\[CapitalOmega]]}];
PL1 = Sort[PL];
data = Table[{Re[PL1[[x]]], Im[PL1[[x]]]}, {x, 500}];
interpolation = Interpolation[data];
ListPlot[interpolation] // AbsoluteTiming

but with N=3000 takes 5 minutes but for N=5000 crash it I do not how depurate it to avoid the mathematica crash Thanks

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