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