[racket] slideshow latex generates poor quality pdf

Hi,

When generating pdf with the very useful slideshow-latex, equations have a
very poor quality.
Has anyone found a solution to this by any chance?

Test case (slidetex.rkt):
#lang slideshow

(require slideshow/latex)

(slide ($ "\\sum_{x\\in {\\cal X}} x^2"))

Then
slideshow --trust --pdf slidetex.rkt

Laurent
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