There are a few rea­sons:

1. If I processed at the time of sav­ing a post, the changes are de­struc­tive. This means:
   • If peo­ple to back to ed­it their work, there will be a mul­ti­tude of hid­den char­ac­ters that will in­ter­fere with their ef­forts
   • Spell check would be bro­ken (in browsers like Fire­fox)
   • If you dis­able the plu­g­in, the changes are still hard­cod­ed, and will not go away.
2. Changes would on­ly ap­ply to posts saved af­ter the plu­g­in was en­abled (not on pre­vi­ous posts, since they have al­ready been saved, and thus

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Maybe. For best per­for­mance, use a per­sis­tent ob­ject cache plu­g­in like WP Re­dis. […]

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