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Linux vs Windows tested in 10 games - Linux 17% faster on Average
(video.hardlimit.com)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
That's probably because there's no native linux client. Elden Ring runs great on Steam Deck (Valve even precompiled the shaders for the Steam Deck, because the PC port constantly compiles them on the fly, leading to stuttering)