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Addresses an issue with slowdowns that could occur when making large numbers of devirtualized calls into MarshalByRefObject-derived code. Addresses an issue where the entire process would be torn down when a NullReferenceException propagated out of an exception filter. Before you install this update, see the Prerequsites and Restart requirement sections. We recommend that you apply this update as part of your regular maintenance routines. The update for Windows 10, version 1909, and Windows Server, version 1909 includes cumulative reliability improvements in. NET Framework 3.5 and 4.8 for Windows 10, version 1909, and Windows Server, version 1909
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