TPDFCompressionLevel Type

Selects the zlib effort level used whilst compressing streams as a document is saved

Declaration

TPDFCompressionLevel= (clNone, clFastest, clDefault, clMaximum);

HPDFDoc

Value	Meaning
`clNone`	No content-stream compression; structural streams keep the Flate form they have by default
`clFastest`	Maps onto the fastest zlib effort level (`zcFastest`)
`clDefault`	Maps onto the standard zlib effort level (`zcDefault`); the property default
`clMaximum`	Maps onto the maximum zlib effort level (`zcMax`)

Assign via the CompressionLevel property of THotPDF; clDefault is the declared default
TPDFVersionManager.GetPreferredCompressionLevel derives a level from the document mode: dmLegacy gives clNone, dmStandard gives clFastest and dmEnhanced gives clMaximum
The xref stream always carries /Filter /FlateDecode whatever the level, so opting out with clNone touches only content-stream compression