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In page Microkernel:

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Although major work on microkernels had largely ended, experimenters continued development.[citation needed] It has since been shown that many of the performance problems of earlier designs were not a fundamental limitation of the concept, but instead due to the designer's desire to use single-purpose systems to implement as many of these services as possible.[citation needed] Using a more pragmatic approach to the problem, including assembly code and relying on the processor to enforce concepts normally supported in software led to a new series of microkernels with dramatically improved performance.