Excel Closing Slowly

Excel seemed to open fast enough for someone in our accounting department, but its closing was glacial.

I removed all Add-ins (File > Options > Add-Ins) and even started it in Safe Mode (Run... excel /s), but it still lagged on close.

Not surprising, Excel has a default template like Word's Normal.dot named ExcelXX.xlb, XX being the version number of Excel, in this case it's 2010 which is version 12.

Once Excel12.xlb was renamed in C:\Users\%username%\AppData\Roaming\Microsoft\Excel, the file was regenerated upon start starting Excel and from then on, it closed without hesitation.

For further troubleshooting steps, visit the overlords at Microsoft.