Last night I decided to flash UD2.5 (i had to flash my back up because of the constant FC's on UD) and noticed that my phones internal storage had almost doubled compared to MIUI. Any ideas as to why there is such a big difference?
Even after reinstalling all my apps on UD, I still had twice the room left.
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I can tell you for sure that theme manager is the cause of this. MIUI used to have a very small memory footprint other than /system. /data was always plenty of space for apps, etc.
The theme manager places theme images in /data/system/theme....w/o touching the framework or app png files. For this reason....all of the theme image files are doubled in the system (essentially)
so...the bigger a theme gets...the more memory it takes up.
there is a theme currently in the works for miui that will not be applied through theme manager...instead will be a recovery update.zip install that will replace the actual files in framework....as well as include themed apks as opposed to using theme manager (which is okay to use for themes that arent all that big).
I really like theme manager as it is much less work and makes theming much simpler, especially with all these MIUI weekly releases. The old way, although most efficient, takes up much less memory.
This is the downside of the D1. limited internal memory. I have never filled mine up though. If needed you can always do an apps2ext and move some apps to that partition.