1) Start time for Nextgen is inherently slow. Much is due to the amount of customization that can be done compared to some other Nav Apps that are more locked down with their look and function. Every line in sys.txt, every UX module, every voice file, every map, etc is processed at start up. If you have already trimmed some things back, you may have saved fractions of seconds (it all add up), but probably nothing much more to do about that.
2) Assuming you are using a TTS voice, you may be missing a line (or more) in it's dictionary.voice file, Like this:
If you know how to edit a voice file successfully, try adding this to dictionary.voice.The speed limit is %s!="The speed limit is %s! Slow down."



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