Not sure what information to include, but I have a custom pack of around 100 mods and this increases memory usage on the server from ~4.9GB to ~6.9GB with one player on

edit: 1.18.2, Saturn version 0.0.1

hmm, the new versions of Saturn optimizes the vanilla biome temperature greatly, can you please try the new versions?
1.19.4 - 1.19.3 - 1.19.2 - 1.18.2