dart:io

level property

int level
final

The compression-level can be set in the range of -1..9, with 6 being the default compression level. Levels above 6 will have higher compression rates at the cost of more CPU and memory usage. Levels below 6 will use less CPU and memory at the cost of lower compression rates.

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https://api.dartlang.org/stable/1.24.3/dart-io/GZipCodec/level.html