I just upgraded from EMET 5.2 to EMET 5.5 late last Friday on my Core i7 Dell XPS 12 Windows 8.1 x64 system at work. I'm using the recommended settings in the wizard and imported the Recommended Software.xml and Popular Software.xml files.

There has been a massive degredation in performance for some of my applicaitons from EMET 5.2 to 5.5. It has made Firefox and Adobe Reader unbearably slow.

It took over 30 seconds for a simple one-page PDF to open in Adobe Reader 11.0.14 and over 5 minutes for it to print (I'm not joking). I turned off EAF for AcroRd32.exe and this greatly sped up the opening of the program but it still prints extremely slowly.

Firefox is just sluggish to do everything. Typing, opening new tabs, switching tabs, scrolling, opening menus, everything is delayed and slow. If I turn off EAF+, the result is the same. If I also turn off EAF, the performance of Firefox is vastly improved.



Internet Explorer 11 and Outlook 2013 seem to be fine. I haven't had the chance to try anything else yet.

My computer is a powerhouse compared to other computers in the organization. I can't imagine deploying EMET 5.5 in this state. We might as well just close the organization because no one would be able to get anything done.

I'm also finding printing anything to be extraordinarily slow. My printer driver also seems to have forgotten my Xerox Fiery Secure Print settings and does not allow me to reset them. I had none of these problems with EMET 5.2.