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Windows 10 slow boot after driver installs
When you boot a client in super client mode it boots slow
When booting a client in super client mode to install drivers or applications, it does not use client cache to cache files that are loaded during booting. hence the boot speed is longer (slower). And when you reboot the client after installing drivers, the data is being sent to the server so it's slow to boot.
Once you have finished installing drivers, disable the super client and then save the image. Once the data has been saved, boot the client normally, it will be slow at first, then reboot the client and it will boot faster as the image data is cached on the server. First boot on any diskless system is slower than the subsequent boots.
Also, make sure that you have "Enabled Client Cache" check and set, client cache helps in boot up of clients.