FearFactory/1.20.1-FearFactoryTest/minecraft/config/structure_layout_optimizer.jsonc

{
    /*
     * Whether to use an alternative strategy to make structure layouts generate slightly even faster than
     * the default optimization this mod has for template pool weights. This alternative strategy works by
     * changing the list of pieces that structures collect from the template pool to not have duplicate entries.
     * 
     * This will not break the structure generation, but it will make the structure layout different than
     * if this config was off (breaking vanilla seed parity). The cost of speed may be worth it in large
     * modpacks where many structure mods are using very high weight values in their template pools.
     * 
     * Pros: Get a bit more performance from high weight Template Pool Structures.
     * Cons: Loses parity with vanilla seeds on the layout of the structure. (Structure layout is not broken, just different)
     */
    "deduplicateShuffledTemplatePoolElementList": false
}