Hi all! When I first flashed this ROM a year ago, I turned on a2sd as well as dc2sd immediately after. However, recently I thought the lag was too much to bear - installing/uninstalling apps would bring the phone to a complete halt, and programs would lag for no apparent reason. I was using a class 10 16GB micro sd card with an ext2 partition.
I searched this thread and many others in vain, trying to get rid of this lag. Someone said something about disabling aufs to get rid of lag, but later said it was not conclusive. I decided to take matters into my own hands and do some testing. To make a long story short, if you had dc2sd turned on, your phone might be lagging often. There doesn't seem to be a way to turn off dc2sd by itself, so in order to fix this, you must (assuming you still want a2sd on):
1. make a nandroid to be safe
2. use mybackup root to backup all apk + data
3. use terminal emulator or adb shell to turn off a2sd (a2sd --disable)
4. reboot to recovery and clear dalvik cache (?)
5. reboot to get out of recovery
6. use terminal emulator or adb shell to turn on a2sd (a2sd --enable)
7. reboot
8. restore apk+data using mybackup root
you will be missing a lot of internal storage space, but the speed increase is worth it. this is just a fyi, in case anyone has this problem..