Rob Heaton wrote a post about shrinking serialized data as part of his excellent PFAB series, and while he talked about a variety of tricks for making the serialization format itself more space efficient, he left out the easiest optimization trick in the book... compression. (It should be noted that he's been splitting up his thoughts on the particular program under analysis across a few posts, so it very well may be the case that he's just saving compression for a later post)
Regardless, I wanted to use his current analysis as a jumping of point to run a quick test and see how various compression algorithms stacked up in terms of space savings.
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