The "magical" developmentmode is magical indeed, as there is little clue in its name regarding waht it actually does.
For sure, it will change the way the template cache it works, by making it compare the timestamps of cached templates with source template files (by default those timestamps are never checked, and you need to clear tpl cache whenever you update a template, unlike the default of the ini cache that does the timestamp checking).
I think it will also have an impact on ezjscore (that will not pack together js and css files when in development mode)
And i am sure it also has some more impacts on caches, but i am not the guru on that aspect (BD might be)
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