[Enlightenment] Switching from xinerama 4k resolution to 2k

Question

Hello,
to make a long story short: How can I switch off xinerama mode in Enlightenment e19 while running the DE?"
Let me explain...
I am about to reinstall my entire Arch Linux system, but before doing that I decided to test the latest Arch Linux on a different disk.
My trouble is my monitor setup. I have an IBM T221 monitor, which is basically four 1920x1200 monitors in one big screen. I have figured out xorg.conf to get the "4K" resolution, and with this line in ~/.xinitrc:
exec enlightenment_start -fake-xinerama-screen 3840x2400+0+0
... it all works perfectly fine.
However, movies don't run so well in that resolution. So what I do in my older e17 install is to simply run this xrandr command:
xrandr \
--screen 0 --size 1920x1200 \
--output DisplayPort-0 --off \
--output DisplayPort-1 --primary --mode 1920x1200 --pos 0x0 \
--output DisplayPort-2 --off \
--output DisplayPort-3 --off
... and that works as expected--I then get the "2K" resolution and movies run smoothly.
On e19 however, that does not work anymore
After running the xrandr script, I get the 2K resolution, but with a framebuffer of 4K; in otherwords, xinerama does not turn off, my screen shows the top left quarter of the 4K setup and when maximizing windows they maximize into the non-existent space...
My solution so far has been to logout, and "startx" with a different xorg.conf file. I wrote two scripts, one called "e2k" and another "e4k", and modified ~/.xinitrc:
e2k
#!/bin/sh
export RESOLUTION=lowres
/usr/bin/startx -- -config xorg.conf-2k
e4k
#!/bin/sh
export RESOLUTION=hires
/usr/bin/startx -- -config xorg.conf
~/.xinitrc
#!/bin/sh
# ~/.xinitrc
# Executed by startx (run your window manager from here)
if [ -d /etc/X11/xinit/xinitrc.d ]; then
for f in /etc/X11/xinit/xinitrc.d/*; do
[ -x "$f" ] && . "$f"
done
unset f
fi
if [ ${RESOLUTION} == 'lowres' ];
then
exec enlightenment_start
else
exec enlightenment_start -fake-xinerama-screen 3840x2400+0+0
fi
And this works well. However, it requires me to logout and login everytime I want to switch resolutions.
Is there a better way?

Answer 1

Just to follow up, Our compositing supervisor was still convinced that running with MP was the way to go, so I worked
with him to run some benchmarks on medium and heavy shots that we determinied would trigger the issue in -MP mode.
The test scene was about 50 frames in length, and we ran it on the same hosts with -MP on and -MP off, and also ran a 
version of bundled frames (10 frames per host/task) and another where we did all 50 frames on a single host (with and without MP).
Interestingly, in every scenerio of these 4 cases, the version with -MP on, was 2-15% faster (despite the 10-11 minute delay at the start in MP mode).
His conclusion was it's still faster with -MP mode ON, and requested that I continue to explore for patches or theories how we might get around the delay.
Have read links:
http://forums.creativecow.net/thread/2/1025525
http://helpx.adobe.com/content/help/en/after-effects/using/memory-storage1.html
Regards,
-Jay-