Custom Shortcut Toolbar on Taskbar is Super Slow

everyone in our office seems seeing same issue: using custom toolbar on taskbar list of shortcuts files on our new server 2012 file server super slow. can take 20-30 seconds open shortcut list first time after logging in or after not using couple hours. seems same speed whether there couple files in list or if there 15.

how 'custom toolbar' created?  since having issues, issue 'custom' code.

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. : | : . : | : . tim

Windows Server  >  Windows Server 2012 General