A major part of slow Citrix logons is the profile size. Exclude the Cookies folder from roaming profiles and you should see a difference in speed.
See link below on how to exclude folders from roaming profiles
Slow Citrix Logons
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I came across your post a couple of days ago. Did not really think your solution would work, but I gave it a shot.
My contract at the company i work for has just been extended. The tip worked and logons are much faster. Thankyou so so so so much