If you are having problems with Citrix Studio and Storefront being very slow on load, this article might help.

On Studio/Storefront startup, Windows tries to verify code integrity by checking the certificate revocation list (CRL) on the internet. If the server has no internet connection, this will result in the MMC being basically unusable. To fix this, CRL checking can be unchecked in the Internet Settings (intetcpl.cpl):

References:

https://support.citrix.com/article/CTX139325