https://spark.lucko.me/JVPgvcVKdu?hl=22216,22320

Seems to be the string concatting here:
https://github.com/LootrMinecraft/Lootr/blob/l10n_1.21/src/main/java/noobanidus/mods/lootr/api/data/ILootrInfo.java#L43
which is kinda weird as i dont expect concatting to normally take that much memory 🤷

Side note, can the default branch be changed to something more recent than 1.16?

That's bizarre! I'll make a note to cache that value.

I believe this has been resolved in recent versions. Please re-open this issue, or open a new issue, if you experience it further.