Helldivers 2 devs slash install size from 154GB to 23GB, thanks to the help of PC port veterans — ditching HDD optimization, 85% size reduction accomplished by de-duplicating game data

Source: Tom’s Hardware

Helldivers 2 Beta Install Size Reduction

The newly released beta version of Helldivers 2 delivers the same gameplay with far less disk usage, offering PC players a much leaner install without sacrificing performance or progression.