Based on this early comparison,
the Windows 11 26H2 preview shows a resource footprint that is effectively identical to 25H2 when running an identical knowledge worker workload. CPU utilization differs by roughly half a percentage point, memory usage is within half a percent, disk reads are unchanged, and disk writes show only a slight increase on the preview build. The 26H2 preview also runs slightly fewer processes on average, but the difference is small and well within what could change before general availability.
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