DirectStorage 1.4 and Zstandard Compression: Faster Game Load Times on the Horizon

Microsoft has released a public preview of DirectStorage 1.4, introducing support for the Zstandard (Zstd) compression algorithm. This update, alongside the initial public preview of the Game Asset Conditioning Library, aims to significantly improve game load times and asset streaming on Windows PCs. The move represents a continued effort to optimize the gaming experience and leverage modern hardware capabilities.

What is DirectStorage?

DirectStorage, first introduced in 2022, is a technology designed to allow games to bypass the CPU for decompression and directly load assets from the NVMe SSD to the GPU. Whereas initial results showed modest improvements (around 10-20% faster load times), Microsoft continues to refine the technology with the goal of unlocking substantial performance gains.

Zstandard: The New Compression Standard

DirectStorage 1.4 integrates Zstd, an open compression standard, into its multi-tier decompression framework. Microsoft evaluated various codecs based on compression ratio, decompression performance, hardware and software availability, and existing adoption. Zstd stood out due to its competitive performance, broad compatibility, and widespread leverage in operating systems, cloud services, and web applications.

Zstd support allows developers to choose between CPU and GPU decompression, optimizing performance based on their workload. Microsoft has also open-sourced a Zstd GPU decompression compute shader on GitHub as a baseline for GPU implementations.

Game Asset Conditioning Library (CAGL)

Complementing DirectStorage 1.4 is the Game Asset Conditioning Library (CAGL). Together with Zstd, CAGL promises to improve compression ratios by up to 50% without increasing CPU or GPU load. Microsoft states this will lead to smoother asset streaming and a more immersive gaming experience.

Industry Support and Future Outlook

Major GPU manufacturers – AMD, Intel, NVIDIA, and Qualcomm – are co-engineering Zstandard compression with Microsoft. AMD plans to release optimizations for its GPUs in the second half of 2026, while Intel is also working on tuning Zstandard decompression across its GPU architectures. Driver support from all these companies is expected before the finish of the year.

With Microsoft’s next Xbox console expected to be more PC-like, DirectStorage is likely to play a key role in its performance. The technology originated on Xbox and was later adapted for Windows PCs.

Availability

The public preview of DirectStorage 1.4 and the Game Asset Conditioning Library are now available for download from Microsoft. Developers are encouraged to begin integrating these technologies into their games to take advantage of the performance improvements.