I haven't tried storing Apps on the SD Card since Gingerbread. I know that the OS doesn't really want you doing this. Also, the internal memory is much faster so less lag when you're talking gaming apps. Just my 2 cents. Sorry if that's all their worth.
Slight lag on SD Card but not much. I just know every time updates for the apps, the app get move to internal storage and stay there. No biggy, just surprised me since my Lumia 1520 kept every thing there once it's install.
That is interesting. I don't thing I have seen this issue with any of the firmwares I had on my G3.
I just checked and only a few of my games are on SD card. Seems like only the really large ones, too.. That reminds me, I have to reinstall Shadowrun (800mb!) again.