Last time I looked at the update performance in windows 10 the issue was that the installers for each of the patches replaced files sequentially, that sequentia

Last time I looked at the update performance in windows 10 the issue was that the installers for each of the patches replaced files sequentially, that sequential execution in turn got delayed by single-threaded antivirus. It could be a lot faster if they parallelized the file operations or deferred the antivirus.