I have tried to compress pdf outputs produced by XeLaTeX. Is it necessary to use GhostScript to compress pdf outputs of XeLaTeX? YES. It is necessary. See Benchmark: xelatex v.s. latex-dvips-ps2pdf, ...
My computer runs on Windows 7 with MikTeX 2.9 and GhostScript 9.02 installed. I am still confused why do I have to invoke gswin64c.exe rather than ps2pdf.exe to convert ps to pdf? The switches I ...