The ZX-calculus is a graphical language for representing and reasoning about quantum information. ZXCalculus.jl is a high-performance package for creating, manipulating, and visualizing ZX-diagrams in Julia. Comparing with a previous Python implementation PyZX, ZXCalculus.jl has 6-50x speed-ups on various tasks of simplifying ZX-diagrams. Moreover, this package is integrated with YaoCompiler.jl and works as a circuit simplification pass in the quantum compiler.