Thread:LOTRMod/@comment-26767096-20170228190157/@comment-25101089-20170304181015

Not in terms of RAM. The only way that could happen is if I were to add more blocks and items than Minecraft supports, or ridiculous amounts of NPC skins, or astronomical numbers of speechbanks, or a map resized by a factor of several. And of course none of that would ever be done.

A slightly more valid concern would be the mod becoming too complex to run, in terms of processing power, rather than too big. For example, all these new gameplay systems I've added - alignment, miniquests, achievements, unit hiring - they all require frequent updates and checks in the code. If there were, say, hundreds of things like this, it could drag performance down beyond a playable level, but I can't really see that happening ever.

There is also the possibility of world generation features like roads and biome variants and rivers having an effect on world generation, and indeed, chunk generation in the LOTR mod is already quite more intensive than in vanilla because of this, but I don't imagine it will become worse any time soon.