Running Tekxit 3 pack https://www.technicpack.net/modpack/tekxit-3-official-1122.1253751
Latest sponge and forge-1.12.2-14.23.5.2838-universal.jar
8GB ram assigned to server, with one player online, doing RTP a couple times instantly exhausts all memory.
Heapdump said the following

Seems this is related to #381

reccomplex-structuredata.dat was 60MB after 80% of a 50k pregen

This still seems extremely excessive, what is actually stored in this?, might be a possibility to use a sqlite db / alternative