Hey there! Much appreciate the response. That's basically it. So basically its what you are saying... either after you end turn, it takes a LONG time to have it compute till the next turn, OR it will hang.
So this is a function of FELH and not xtradeconstruct? would it be even more complicated if one had the mods i had mentioned prior? i'd love to have them back, but the hanging etc.. is pretty bad.
Far as I understand/know the following is true - but this is not 100% knowledge, I could be more or less wrong:
The slowness and the end turn hang are different things and not the same thing.
The end turn hang is due to one (or more) bug/s in FELH 2.5.1. The more is happening during end turn computation the more potential for it to happen. So if you have more AIs, more difficult (especially 'insane' ones) AIs, bigger map, more mods etc then it is more likely to happen. And in that case the end turn also takes longer. So if the end turn takes longer its more likely to happen even though its not directly related.
The slowness with Xtra mod comes from 2 things. One is more data/calculations due to the mod being added. The other is indirect - the AI is modified (presumably buffed => more units/cities/whatever) and due to that requires more CPU. I do not know which of those two parts is dominant.
For end turn hang you can do the following - this is not 100% but may help reduce occurrences and may help to recover:
1. Always quicksave before pressing end turn (Ctrl-S I think).
2. Zoom out fully.
3. Wait a few seconds.
4. Press 'a' (or end turn button).
5. Wait until everything is computed - do not click any buttons or anything else while its still computing.
If you are unsure if it is an end turn hang or not (sometimes computation can take very long - do not underestimate this) you can look at the CPU use: If its an end turn hang it shows zero CPU use - at least for me, may be different on other systems.
Adding more mods: I dont know. Far as I remember the Xtra description says the Rivermod part from Children of Storm causes end turn hangs. This can be disabled though so you can use Children of Storm without Rivermod.