Excel 2013: Slow performance loading Excel Sheets

Our customer is migrating from Vista/Office 2007 to Windows 7/Office 2013 and they have the following configurations:
VDI Windows 7 PRO x64, XenDesktop 5.6 - 2 Core on ESX 5.0, 4GB, VDI on SSD
VDI Windows 7 PRO x64, XenDesktop 5.6 - 2 Core on ESX 5.5, 4GB, VDI on SSD
Laptop, Windows 7 PRO x64, 4 core (+HT) i7, 8GB, SSD
Advanced workstation, Windows 7 PRO x64, dual 8 core Xeon (No HT), 32GB, SSD
On all these systems we tested Excel 2013 (patched until today) in both 32-bit as 64-bit versions. Both as AppV and Native install.
When we open an Excel worksheet, approx 220MB with a lot of cell's and rows, Excel takes approx 2-4 minutes to open the sheet, even when calculations do not apply. In Excel 2007, the same sheet opens within 20 seconds and even faster.
What we tried:
Auto calculation - Disabled
All fancy stuff in Excel - Disabled
excel.exe.config with settings to bypass some certifcate checks
Disabled and finally removed allmost every plugin
Playing with a lot of options in Excel 2013
To have a cross check, we reproduced the problem at an other client with both Excel 2013 and Excel 2010. And the problem still exists allthough Excel 2010 is not as bad as Excel 2013.
Is there any solution for this problem other then not use Office 2010/Office 2013 and stick with Office 2007 (what has other problems in combination with newer software so is also not an option)?
Update dec 17, 2014:
Tested with Safe Mode - No solution
Tested with Trusted locations - No solution

George,
I did do some tests as suggested and I found a huge difference between the handling of Excel 2007/2010 and 2013. I did see some strange behaviour.
I created an Excel Sheet in all 3 environments with identical steps to get identical sheets. After save i discovered the following:
On Excel 2007/2010 the test sheet was:
Test Sheet.xlsx - 191.894 kB
Test Sheet.xls - 614.881 kB
On Excel 2013 test sheet was:
Test Sheet.xlsx - 187.378 kB
Test Sheet.xls - 336.092 kB
After that we repeated tests, but due to some problems with the Vista/2007 workstation I was not able to continue my tests, and maybe tomorrow I can do the tests there.
When I was testing with 2010 and 2013 i discovered there are some phases when loading a sheet. And there is where 2013 in my opinion does something not good. The tests run from "Open" until the sheet can be "Edited".
Under Excel 2010 the phases can be defined as: Download, Validate, Open, Calculate, Display, Editable
Under Excel 2013 the phases can be defined as: Download, Validate, Open, Calculate, Calculate, Display, Editable
What i noticed is that Excel 2013 does calculate the sheet 2 times instead of one time. And I made some tests with this knowledge.
Test/Stage
Type
Download
Open/Validate
Calculate 1
Calculate 2
Ready
Excel 2013
xls
0:17
0:38
1:15
1:48
2:17
Excel 2013
xlsx
0:10
1:18
1:49
2:28
2:32
Excel 2010
xls
0:27
3:03
3:36
3:42
Excel 2010
xlsx
0:08
0:56
1:10
1:13
Excel 2010 (2013 sheet)
xlsx
0:06
0:53
1:09
1:14
So there is a second calculation loop in Excel 2013 what takes a lot of time. And i discovered some other problems when creating my test sheets where recalcuation makes a mess of it, but that is a later issue.

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