There is a 30 seconds to 5 minutes logon delay for some users when launching XenApp published apps.

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Following is CDF traces taken on the XenApp server while reproducing the issue. According to the CDF trace, 726 printers were being mapped in the session: 

Checking DriverMappingList policy for Driver " HP LaserJet P2015 Series PCL 6".    
609364 \src\ntsys\print\cpsvc\svccore    668    5356   26/07/2013 07:56:53.393    CSessionDbg.cpp       CSession::SessionCdfTraceExit     93     CDF_ENTRY     =======>>> SESSION EXIT in CSession::CreateClientPrinter :: Prt Cnt = 723, Policies = 104710, Session = 4, UID = pmedrano, Log Count = 4, m_pIcaName = AL07P100019 :: SUCCESS
609366 \src\ntsys\print\cpsvc\svccore    668    5356   26/07/2013 07:56:53.393    CSessionDbg.cpp       CSession::SessionCdfTraceExit     93     CDF_ENTRY     =======>>> SESSION EXIT in CSession::CreateClientPrinterByName :: Prt Cnt = 723, Policies = 104710, Session = 4, UID = pmedrano, Log Count = 4, m_pIcaName = AL07P100019 :: SUCCESS 
609377 \src\ntsys\print\cpsvc\svccore    668    5356   26/07/2013 07:56:53.394    CSessionDbg.cpp       CSession::SessionCdfTraceExit     93     CDF_ENTRY     =======>>> SESSION EXIT in CSession::GetAutoClientPrinterInfo :: Prt Cnt = 723, Policies = 104710, Session = 4, UID = pmedrano, Log Count = 4, m_pIcaName = AL07P100019 :: SUCCESS 
609386 \src\ica\Printing\cpsvc\svccore   668    5356   26/07/2013 07:56:53.394    CSessionPrinter.cpp       CSessionPrinter::CreateClientPrinterUsingPolicies      973    CDF_INFO       CSessionPrinter::CreateClientPrinterUsingPolicies: Checking DriverMappingList policy for Driver " HP LaserJet P2015 Series PCL 6".    
610340 \src\ntsys\print\cpsvc\svccore    668    5356   26/07/2013 07:56:53.574    CSessionDbg.cpp       CSession::SessionCdfTraceExit     93     CDF_ENTRY     =======>>> SESSION EXIT in CSession::CreateClientPrinter :: Prt Cnt = 724, Policies = 104710, Session = 4, UID = pmedrano, Log Count = 4, m_pIcaName = AL07P100019 :: SUCCESS
610342 \src\ntsys\print\cpsvc\svccore    668    5356   26/07/2013 07:56:53.574    CSessionDbg.cpp       CSession::SessionCdfTraceExit     93     CDF_ENTRY     =======>>> SESSION EXIT in CSession::CreateClientPrinterByName :: Prt Cnt = 724, Policies = 104710, Session = 4, UID = pmedrano, Log Count = 4, m_pIcaName = AL07P100019 :: SUCCESS 
610353 \src\ntsys\print\cpsvc\svccore    668    5356   26/07/2013 07:56:53.575    CSessionDbg.cpp       CSession::SessionCdfTraceExit     93     CDF_ENTRY     =======>>> SESSION EXIT in CSession::GetAutoClientPrinterInfo :: Prt Cnt = 724, Policies = 104710, Session = 4, UID = pmedrano, Log Count = 4, m_pIcaName = AL07P100019 :: SUCCESS 
610362 \src\ica\Printing\cpsvc\svccore   668    5356   26/07/2013 07:56:53.575    CSessionPrinter.cpp       CSessionPrinter::CreateClientPrinterUsingPolicies      973    CDF_INFO       CSessionPrinter::CreateClientPrinterUsingPolicies: Checking DriverMappingList policy for Driver " HP LaserJet P2015 Series PCL 6".    
611316 \src\ntsys\print\cpsvc\svccore    668    5356   26/07/2013 07:56:53.767    CSessionDbg.cpp       CSession::SessionCdfTraceExit     93     CDF_ENTRY     =======>>> SESSION EXIT in CSession::CreateClientPrinter :: Prt Cnt = 725, Policies = 104710, Session = 4, UID = pmedrano, Log Count = 4, m_pIcaName = AL07P100019 :: SUCCESS
611318 \src\ntsys\print\cpsvc\svccore    668    5356   26/07/2013 07:56:53.767    CSessionDbg.cpp       CSession::SessionCdfTraceExit     93     CDF_ENTRY     =======>>> SESSION EXIT in CSession::CreateClientPrinterByName :: Prt Cnt = 725, Policies = 104710, Session = 4, UID = pmedrano, Log Count = 4, m_pIcaName = AL07P100019 :: SUCCESS 
611329 \src\ntsys\print\cpsvc\svccore    668    5356   26/07/2013 07:56:53.767    CSessionDbg.cpp       CSession::SessionCdfTraceExit     93     CDF_ENTRY     =======>>> SESSION EXIT in CSession::GetAutoClientPrinterInfo :: Prt Cnt = 725, Policies = 104710, Session = 4, UID = pmedrano, Log Count = 4, m_pIcaName = AL07P100019 :: SUCCESS 
611338 \src\ica\Printing\cpsvc\svccore   668    5356   26/07/2013 07:56:53.768    CSessionPrinter.cpp       CSessionPrinter::CreateClientPrinterUsingPolicies      973    CDF_INFO       CSessionPrinter::CreateClientPrinterUsingPolicies: Checking DriverMappingList policy for Driver " HP LaserJet P2015 Series PCL 6".    
612292 \src\ntsys\print\cpsvc\svccore    668    5356   26/07/2013 07:56:53.966    CSessionDbg.cpp       CSession::SessionCdfTraceExit     93     CDF_ENTRY     =======>>> SESSION EXIT in CSession::CreateClientPrinter :: Prt Cnt = 726, Policies = 104710, Session = 4, UID = pmedrano, Log Count = 4, m_pIcaName = AL07P100019 :: SUCCESS
612294 \src\ntsys\print\cpsvc\svccore    668    5356   26/07/2013 07:56:53.966    CSessionDbg.cpp       CSession::SessionCdfTraceExit     93     CDF_ENTRY     =======>>> SESSION EXIT in CSession::CreateClientPrinterByName :: Prt Cnt = 726, Policies = 104710, Session = 4, UID = pmedrano, Log Count = 4, m_pIcaName = AL07P100019 :: SUCCESS 
612305 \src\ntsys\print\cpsvc\svccore    668    5356   26/07/2013 07:56:53.966    CSessionDbg.cpp       CSession::SessionCdfTraceExit     93     CDF_ENTRY     =======>>> SESSION EXIT in CSession::GetAutoClientPrinterInfo :: Prt Cnt = 726, Policies = 104710, Session = 4, UID = pmedrano, Log Count = 4, m_pIcaName = AL07P100019 :: SUCCESS 
612314 \src\ica\Printing\cpsvc\svccore   668    5356   26/07/2013

 

Looking for the DriverMappingList key in Process Monitor showed that CpSvc.exe is querying it many times: 


It matches process PID (CpSvc) that queries this value. Also the time it takes (two tries each) 7:56:53.768 for example
There are 1692 occurrences of this during the entire printer mapping (app start) in ProcMon:


There are only 6 printers installed locally on the client machine. However, something on the server side or client side makes the server think that there many printers mapped on the client.
 
First tried to delete the server profile, but with a new server profile also the behavior was the same. Then the client machine profile was investigated and found that under the following registry key there many printer properties (some outdated):
HKEY_CURRENT_USER\Software\Citrix\PrinterProperties

Resolution

Delete the registry key from the client side to change the logon time from 5 minutes to 15 seconds. Customer applied a logon script for the client machine that deletes that registry key during the user logon.

This article is a case study of the 30 Seconds to 5 Minutes Logon Delay for Users when Launching XenApp Published Apps.