Is there a way to get rid of the welcome page in MonoDevelop?
Yes. In the MonoDevelop preferences, go to the Visual Style section, and uncheck “Load welcome page on startup”.
Why does my script open in MonoDevelop when I have selected Visual Studio as my script editor?
This happens when VS reports that it failed to open your script. The most common cause for this is an external plugin (e.g. Resharper) popping up a dialog at startup, requesting input from the user - this will cause VS to report that it failed to open.
Slow framerate and/or visual artifacts.
This may occur if your video card drivers are not up to date. Make sure you have the latest official drivers from your card vendor.
Shadows also require certain graphics hardware support. See Light Performance page for details.
Shadows on Android and iOS have these limitations: soft shadows are not available and in forward rendering rendering path only a single directional light can cast shadows. There is no limit to the number of lights casting shadows in the deferred rendering path.