According tomedia reports, Windows 10 update KB4535996, KB4540673 and KB4551762 may make the computer start slower than usual, there are already many users feedback on this issue. At present, Microsoft has not explained this matter, from some feedback from netizens, it may be not compatible with the Windows 10 update driver or software triggered, or the update itself is the problem.
(With via Windows Latest)
Many users blamed the performance issue on the optional update KB4535996, while others blamed Windows 10 KB4540673 / KB4551762 for the problem.
Theoretically, KB4535996 is a preview of the March update, and if you don’t install the update on your PC, you’ll get the fixes and improvements introduced by KB4535996 in Windows 10 KB4540673. If you do not install both updates on your PC, all of these fixes will be included in KB4551762.
In order to confirm the above, somemedia also specially experimented, the result is that Windows 10 KB4535996 resulting in performance degradation, uninstalling the patch can restore the original performance of the hardware. If overall performance is still slow, KB4540673 should be reinstalled.
Therefore, users with the same problem, or in advance to prepare, if you feel that the performance is too slow, their own shot than Microsoft follow-up more reliable.