There are a number of file extensions that are already mostly compressed that are not yet listed in DEFAULT_DONT_COMPRESS in loadparm.c. These are probable candidates to add: - webm (audiovisual media file formt) - webp (image format) - ogv (Ogg container format) - squashfs (used for e.g. Debian live images) I'm sure there are more, hopefully people can add those to this bug report?
I just added the extensions you mentioned.