An update:
finally I have been able to look into this project of mine again.
Well, I have reduced the loading time of the dictionary-files dramatically and now both are loaded within 3 seconds on my device.
Anyway, as already mentioned in a previous post of mine, the big news is that I have transformed this project into a class-library written in VB.NET. It works so far without any problems but before releasing it, I just need to add two or three missing features. I have tested the library in a sample-project in VB.NET and it works nicely although of course there may be a few bugs not yet discovered. I will most likely make a posting on XDA where developers can download it and test it.
The bad news: While the loading of the data works allright in a Basic4PPC-project, the spellchecking-engine does not

This is due to the textbox-control of Basic4PPC which must be passed on to the library. However, I will later post a question in the Library-section of this forum and see if anyone can help to get the library compatible with Basic4PPC.
Regards,
moster67