Wow now this is funny, right after reading on XDA today I found some article to boost performance on some tablet so I just checked it out outta curiousity and it was deodex/odex build.prop tweak, just like what you posted just now metalspring, but from like january and hasn't had a post since april:
(TWEAK'S) Deodex/odex tweak build.prop tweaks etc - xda-developers
I figured it's just that same one that we started using for the OG where u enter the commands into terminual emulator and then put them into /system/build.prop but now I'm hella confused haha. So for the OG it would be as so?....:
dalvik.vm.dexopt-flags=v=a or f(which one or like it says it doesn't matter or not sure what the difference is rather)o=v, then u=y for single-core OG?, and m=y is that so maps is constatly running? I always just FC Maps when it's running when I'm not using it, if that's even the same maps that applies to this hahaha....any kinda clarification would be kick ass!!
