Microsoft is working on a fix for PC shader stutter
Briefly

Microsoft is creating an advanced shader delivery feature for the ASUS ROG Xbox Ally handhelds to make loading faster and reduce stutter. The system preloads game shaders during download, which Microsoft says can allow games to launch up to ten times faster, run smoother, and use less battery on first play. Shader stutter occurs on PC because shaders must be downloaded and compiled for varied hardware, often causing launch delays and framerate drops during initial play. The delivery feature likely requires developer adoption, so it may not impact every game at launch. Handheld Windows will minimize background activity and defer non-essential tasks to devote more resources to gaming.
Microsoft is creating a new "advanced shader delivery" feature for the ASUS ROG Xbox Ally handhelds that might make loading games faster and more stutter-free. The company teased the upcoming feature alongside the announcement of the launch date for the first Xbox-branded handhelds and the company's new compatibility system for figuring out if games will run well on handhelds. It sounds like this new shader delivery system will require some amount of buy-in from developers, which means it likely won't impact every game at launch.
Typically, a game downloads shaders when they're first launched, which can add to the wait before you can actually start playing, and lead to things like framerate drops as shaders are compiled in the background. Microsoft's system "preloads game shaders during download" which the company says will allow games to launch up to 10 times faster, "run smoother, and use less battery on first play."
Read at Engadget
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