Wikipedia lists this as a serious flaw of GE:
Game Editor can have problems if large numbers of scripts are present, where objects can behave abnormally. An example of this is that some objects will conduct an event at an undesirable time, and sometimes parts of scripts can be completely missed. This can make large levels in a single file close to obsolete; if large levels were to be created, it is recommended that these levels be divided up into separate files.
I would like to know how accurate is this and if it is - what is the optimal number of scripts and size of level.