High RAM usage in Windows 11 isn't always a problem. Modern Windows treats RAM as a resource to use, not conserve, preloading frequently used apps and files via Sys Main (formerly Super Fetch) to improve responsiveness. This cached data counts as available memory and can be reclaimed instantly.
While 16GB is standard, seeing over 50% usage is normal due to intelligent memory management. Issues arise only if performance degrades, apps crash, or low-memory alerts appear—then check Task Manager's Processes tab, close unused apps, restart to fix memory leaks, and disable unnecessary startup apps. Avoid third-party memory cleaners, as they can slow performance by forcing data to the page file.
Disabling Sys Main is only advisable on older PCs with mechanical drives where constant preloading causes sluggishness.
Source: Engadget · Summarized by HeadlinesBriefing