I am confused why XeLaTeX can produce a pdf output from an input file that contains PSTricks codes, PNG, JPEG, PDF, EPS images. It is the first time I use XeLaTeX and I am really surprised that I can import images from many different format in the same input file.
Usually I use latex-dvips-ps2pdf to compile my input file that contains PSTricks codes and only EPS images. If I have PNG, JPEG and PDF images, I must convert them in advance to get the EPS version.
Unfortunately, XeLaTeX runs slower than latex-dvips-ps2pdf. I don't know why. Behind the scene, what steps are actually done by XeLaTeX when compiling input files with PSTricks codes, jpeg, png, eps, pdf images?