Outlook 2013 – Slow Performance

I found a solution that seems to work (I'm using Outlook 2007). Say you got an email and you hit reply. Looking at your reply email with that blue indent line click on the "options" pull down menu and then change the format to "Rich Text". Enter your reply in the body of the email and select your reply line or paragraph and then ctrl-Q. The blue line for that paragraph or email is gone. I tested this by sending the email back to myself and it seems to work.

If the format is HTML it won't work... although ctrl-Q seems to remove the blue indent line when I send the email back to myself the line comes back. But in Rich Text format the solution sticks...

This article suggests creating the following registry value:

[HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Common\Graphics]
"DisableAnimations"=dword:00000001

Or you can try downloading the registry file with this setting in it from here (source). I haven't yet used Office 2013, however, so I can't verify that this works.

Since someone asked, I did some more research on the issue. I found this Microsoft blog where the author describes three ways to enforce this setting:

1. The registry, as above.

2. In Outlook, go Options --> Advanced --> Display --> Disable hardware graphics acceleration. This makes @Niko's answer below correct as well. I've confirmed that enabling and disabling this option changes the data for the DisableAnimations registry value (0x1 for checked, 0x0 for unchecked).

3. Group policy ADM. If you use the Office 2013 group policy templates, the "Do not use hardware graphics acceleration" policy can be enabled.