diff --git a/pumpkin-world/src/generation/biome.rs b/pumpkin-world/src/generation/biome.rs
index 535a039d0..e97260b09 100644
--- a/pumpkin-world/src/generation/biome.rs
+++ b/pumpkin-world/src/generation/biome.rs
@@ -1,4 +1,4 @@
-use pumpkin_util::math::{square, vector3::Vector3};
+use pumpkin_util::math::{floor_mod, square, vector3::Vector3};
 
 use super::biome_coords;
 
@@ -134,13 +134,7 @@ fn score_permutation(
 
 #[inline]
 fn scale_mix(l: i64) -> f64 {
-    const RECIPROCAL_1024: f64 = 1.0 / 1024.0;
-
-    // Use a bitwise AND for a faster modulus by a power of two
-    let scaled_l = (l >> 24) & 1023;
-
-    // Use a multiplication instead of a division
-    let d = scaled_l as f64 * RECIPROCAL_1024;
+    let d = floor_mod(l >> 24, 1024i32 as i64) as i32 as f64 / 1024.0;
 
     (d - 0.5) * 0.9
 }
diff --git a/pumpkin-world/src/generation/surface/mod.rs b/pumpkin-world/src/generation/surface/mod.rs
index 7f4547bf4..518afef86 100644
--- a/pumpkin-world/src/generation/surface/mod.rs
+++ b/pumpkin-world/src/generation/surface/mod.rs
@@ -1,3 +1,6 @@
+use std::{cell::RefCell, num::NonZeroUsize};
+
+use lru::LruCache;
 use pumpkin_data::chunk::Biome;
 use pumpkin_util::{
     math::{lerp2, vector2::Vector2, vector3::Vector3, vertical_surface_type::VerticalSurfaceType},
@@ -395,7 +398,7 @@ pub struct VerticalGradientMaterialCondition {
     true_at_and_below: YOffset,
     false_at_and_above: YOffset,
     #[serde(skip)]
-    random_deriver: ThreadLocal<RandomDeriver>,
+    random_deriver: ThreadLocal<RefCell<LruCache<usize, RandomDeriver>>>,
 }
 
 impl VerticalGradientMaterialCondition {
@@ -403,9 +406,21 @@ impl VerticalGradientMaterialCondition {
         let true_at = self.true_at_and_below.get_y(context.min_y, context.height);
         let false_at = self.false_at_and_above.get_y(context.min_y, context.height);
 
-        let splitter = self.random_deriver.get_or(|| {
-            let random_deriver_clone = context.random_deriver;
-            random_deriver_clone
+        let context_pointer: *const RandomDeriver = context.random_deriver;
+        let key = context_pointer.addr();
+
+        let mut cache = self
+            .random_deriver
+            .get_or(|| {
+                let cache_size = NonZeroUsize::new(128).unwrap();
+                let cache = LruCache::new(cache_size);
+                RefCell::new(cache)
+            })
+            .borrow_mut();
+
+        let splitter = cache.get_or_insert(key, || {
+            context
+                .random_deriver
                 .split_string(&self.random_name)
                 .next_splitter()
         });