Data storage io techniques for ordinary desktop applications needed

hello everyone.
i'm writing an offline tool for a mmo game (eve online) which is planned to be a useful help in analyzing economics in that game for maximizing the player's efficiency in making money.
i intend to implement algorithms who need a set of pre-defined values of specific object types, e.g. ores, minerals and spaceships. so it's logical that i must add these values stored in some file.
my first idea was to implement some script files for storing these values. this solution would make the tool read these files in and generate objects from the scripts on each start-up of the application.
unfortunately it's possible that the number of object values will exceed to an amount too big for a quick and user-friendly start of the tool and too small for a full-fledged database. so the basic problem/question is: how can i avoid an annoying start-up time caused by reading in large files and generating objects all the time?
probably some of you might point to the ObjectInputStream which might be a lot faster for creating objects from file data. Of course, this makes sense since these objects never change. but this solution would have 3 main contras:
a) if i had to change values of a pre-defined object, a script file would make changes much easier than a object file.
b) in my opinion, it's not really the oop way to store 20-50 objects in different object files, although they are instances of the same class. it's much more "elegant" just to store the pure values and let a method read in the values and generate a bunch of instances of a class.
c) the user would not be able to change the values on his own. a simple script language would give the user more freedom in customizing the application for his needs, e.g. a new game patch changes the values of special minera types.
oh, if you try to guess the data structs that organize the objects in runtime: i tend to use simple lists or search trees.
so, does anyone know a good alternative way for providing a semi-large amount of pre-defined object values to an offline desktop application?
thx.

I don't think the amount of data could possibly be so much that load time would be an issue. If you are talking about the amount of work you need to do to build classes for all the different types of data, you could instead save the data as XML files, and then use a technology like JAXB to automatically build the classes for you. These classes know how to read and write the data based on some XML Schema.

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Data storage io techniques for ordinary desktop applications needed

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