Bandizip, the archiving software from Bandisoft, has an issue that its processing speed is very low when decompressing an archive in which multiple files of small sizes are stored. Windows Defender performs an AV scan for every file which has been newly created as a result of the decompression by Bandizip, and therefore a significant delay occurs during the decompression. As evidence, 7-Zip and other archivers do not have such an issue, and adding Bandizip to the exclusion list for the Defender's AV scan also removes this issue. It is required for Microsoft to add Bandizip ("Bandizip.exe" and "bz.exe") to the default exclusion list for the Defender's AV scan since the archiver is widely and commonly used in Korea and the rest of the world.
Bandizip's official website: https://www.bandisoft.com/bandizip/