The cloud drive is a Network drive. Because of this, Windows searches the Network drives every once in a while when the cloud drive is accessed.


Please see the possible solutions to slow startup speed below:


1. There is a Network drive attached that is not available. 


This is marked with a red X. This drive is not available to Windows, but it still tries to connect to it, which might take up to a minute.


Solution: 


Disconnect the Network drives that display a red X. (Right click on the Network drive in Explorer and click disconnect).



2. Check the "Receive Windows Auto-tuning level" and try a setting of disabled on Windows 7, 8, and 10.


For this solution, you will need to have administrator rights on the system.


Solution: 

You will need to use an elevated command prompt:


    -Click on the start or search button on your task bar.

    -In the search bar, type "cmd" without the quotation marks.

    -The search result should include an application called "command prompt" or "cmd".

    -Right-click on this application and click "Run as administrator".

    -If prompted for confirmation, click continue.

    -Now you are using an elevated command prompt.


In the elevated command prompt, type:


    netsh interface tcp show global


This will show the state of the auto-tuning. 



If it says normal, try setting it to disabled:


    netsh interface tcp set global autotuning=disabled


To confirm that it is disabled, type:


    netsh interface tcp show global


If this does not help, or if you experience other Network issues after this change, use the following command to revert it to normal:


    netsh interface tcp set global autotuning=normal