Many reasons for long processing time and probably need to work with SharePoint admins.
Check that there are enough resources (ie.memory, processing, disk space, etc)
Also, one that I run into many times for slow performance is the Virus protection in not properly configured. SharePoint and project directories are normal exclude in the scans.
Michael Wharton, MVP, MBA, PMP, MCT, MCTS, MCSD, MCSE+I, MCDBA
Website http://www.WhartonComputer.com
Blog http://MyProjectExpert.com contains my field notes and SQL queries