I have coded quite a number of EDB files and have probably been doing it longer than most, and I cannot say I have ever observed any issue with CTDs regarding format - or lack of load speed. I should add that I've coded some pretty long and complex ones too ;)
Regarding roads, it's possible they have been nullified by the flooding bug perhaps - though I think iirc that also stops you from building them - they'll be some posts on it somewhere. It usually is noticed when watchtowers cannot be built. I've never observed this (probably because I do not build watchtowers or be observant enough ; ) though.
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