1# Bundle Manager Subsystem Changelog
2
3## cl.bundlemanager.1 Compression Level of libs Changed in the Packing Tool
4
5**Access Level**
6
7Others
8
9**Reason for Change**
10
11When the **compressNativeLibs** parameter in the [module.json5 file](../../../application-dev/quick-start/module-configuration-file.md) is set to **true**, the packing tool packs **libs** in a lower compression level (changed from 5 to 1). This slightly increases the package size but speeds up packaging.
12
13**Change Impact**
14
15This change is a compatible change. When **compressNativeLibs** in the [module.json5 file](../../../application-dev/quick-start/module-configuration-file.md) is set to **true**, the size of the unsigned package slightly increases.
16
17**API Level**
18
1911
20
21**Change Since**
22
23OpenHarmony SDK 4.1.6.2
24
25**Key API/Component Changes**
26
27When **compressNativeLibs** in the [module.json5 file](../../../application-dev/quick-start/module-configuration-file.md) is set to **true**, the packing tool packs the **libs** library at the default compression level (5) before the modification. After the modification, the packing tool packs the **libs** library at the fast compression level (1).
28
29**Adaptation Guide**
30
31No adaptation is required.
32