diff --git a/src/main/java/me/cortex/voxy/common/voxelization/WorldConversionFactory.java b/src/main/java/me/cortex/voxy/common/voxelization/WorldConversionFactory.java
index 099e359e..d6086120 100644
--- a/src/main/java/me/cortex/voxy/common/voxelization/WorldConversionFactory.java
+++ b/src/main/java/me/cortex/voxy/common/voxelization/WorldConversionFactory.java
@@ -154,28 +154,24 @@ public class WorldConversionFactory {
             long sample = 0;
             int c = 0;
             int dec = 0;
-            for (int y = 0; y < 16; y++) {
-                for (int z = 0; z < 16; z++) {
-                    for (int x = 0; x < 16; x++) {
-                        if (dec-- == 0) {
-                            sample = bDat[c++];
-                            dec = iterPerLong;
-                        }
-                        int bId;
-                        if (bps == null) {
-                            bId = pc[(int) (sample & MSK)];
-                        } else {
-                            bId = stateMapper.getIdForBlockState(bps.get((int) (sample&MSK)));
-                        }
-                        sample >>>= eBits;
+            for (int i = 0; i < 0xFFF; i++) {
+                if (dec-- == 0) {
+                    sample = bDat[c++];
+                    dec = iterPerLong;
+                }
+                int bId;
+                if (bps == null) {
+                    bId = pc[(int) (sample & MSK)];
+                } else {
+                    bId = stateMapper.getIdForBlockState(bps.get((int) (sample&MSK)));
+                }
+                sample >>>= eBits;
 
-                        byte light = lightSupplier.supply(x, y, z);
-                        if (!(bId == 0 && (light == 0))) {
-                            data[G(x, y, z)] = Mapper.composeMappingId(light, bId, biomes[((y & 0b1100) << 2) | (z & 0b1100) | (x >> 2)]);
-                        } else {
-                            data[G(x, y, z)] = Mapper.AIR;
-                        }
-                    }
+                byte light = lightSupplier.supply(i&0xF, (i>>8)&0xF, (i>>4)&0xF);
+                if (!(bId == 0 && (light == 0))) {
+                    data[i] = Mapper.composeMappingId(light, bId, biomes[Integer.compress(i,0b1100_1100_1100)]);
+                } else {
+                    data[i] = Mapper.AIR;
                 }
             }
         } else {
@@ -183,15 +179,17 @@ public class WorldConversionFactory {
                 throw new IllegalStateException();
             }
             int bId = pc[0];
-            for (int y = 0; y < 16; y++) {
-                for (int z = 0; z < 16; z++) {
-                    for (int x = 0; x < 16; x++) {
-                        byte light = lightSupplier.supply(x, y, z);
-                        if (!(bId == 0 && (light == 0))) {
-                            data[G(x, y, z)] = Mapper.composeMappingId(light, bId, biomes[((y & 0b1100) << 2) | (z & 0b1100) | (x >> 2)]);
-                        } else {
-                            data[G(x, y, z)] = Mapper.AIR;
-                        }
+            if (bId == 0) {//Its air
+                for (int i = 0; i < 0xFFF; i++) {
+                    data[i] = Mapper.airWithLight(lightSupplier.supply(i&0xF, (i>>8)&0xF, (i>>4)&0xF));
+                }
+            } else {
+                for (int i = 0; i < 0xFFF; i++) {
+                    byte light = lightSupplier.supply(i&0xF, (i>>8)&0xF, (i>>4)&0xF);
+                    if (light != 0) {
+                        data[i] = Mapper.composeMappingId(light, bId, biomes[Integer.compress(i,0b1100_1100_1100)]);
+                    } else {
+                        data[i] = Mapper.AIR;
                     }
                 }
             }
@@ -199,6 +197,14 @@ public class WorldConversionFactory {
         return section;
     }
 
+
+
+
+
+
+
+
+
     private static int G(int x, int y, int z) {
         return ((y<<8)|(z<<4)|x);
     }
diff --git a/src/main/java/me/cortex/voxy/common/world/WorldUpdater.java b/src/main/java/me/cortex/voxy/common/world/WorldUpdater.java
index 341798f6..137df550 100644
--- a/src/main/java/me/cortex/voxy/common/world/WorldUpdater.java
+++ b/src/main/java/me/cortex/voxy/common/world/WorldUpdater.java
@@ -14,6 +14,7 @@ public class WorldUpdater {
         if (!into.isLive) throw new IllegalStateException("World is not live");
         boolean shouldCheckEmptiness = false;
         WorldSection previousSection = null;
+        final var vdat = section.section;
 
         for (int lvl = 0; lvl < MAX_LOD_LAYER+1; lvl++) {
             var worldSection = into.acquire(lvl, section.x >> (lvl + 1), section.y >> (lvl + 1), section.z >> (lvl + 1));
@@ -45,9 +46,9 @@ public class WorldUpdater {
                 var secD = worldSection.data;
                 for (int i = 0; i <= 0xFFF >> (lvl * 3); i++) {
                     int secIdx = Integer.expand(i, secMsk)+baseSec;
-                    long newId = section.section[baseVIdx+i];
+                    long newId = vdat[baseVIdx+i];
                     long oldId = secD[secIdx]; secD[secIdx] = newId;
-                    nonAirCountDelta += Mapper.isAir(oldId) == Mapper.isAir(newId) ? 0 : (Mapper.isAir(newId) ? -1 : 1);
+                    nonAirCountDelta += (Mapper.isAir(newId)?1:0)-(Mapper.isAir(oldId)?1:0);
                     didStateChange |= newId != oldId;
                 }
             }
@@ -87,4 +88,16 @@ public class WorldUpdater {
             previousSection.release();
         }
     }
+
+    public static void main(String[] args) {
+        int MSK = 0b110110010100;
+        int iMSK = ~MSK;
+        int iMSK1 = iMSK+1;
+        int i = 0;
+        do  {
+            System.err.println(Integer.toBinaryString(i));
+            if (i==MSK) break;
+            i = (i+iMSK1)&MSK;
+        } while (true);
+    }
 }
diff --git a/src/main/java/me/cortex/voxy/common/world/other/Mapper.java b/src/main/java/me/cortex/voxy/common/world/other/Mapper.java
index 94f613aa..27045363 100644
--- a/src/main/java/me/cortex/voxy/common/world/other/Mapper.java
+++ b/src/main/java/me/cortex/voxy/common/world/other/Mapper.java
@@ -74,6 +74,10 @@ public class Mapper {
         return (id&(~(0xFFL<<56)))|(Integer.toUnsignedLong(light&0xFF)<<56);
     }
 
+    public static long airWithLight(int light) {
+        return Integer.toUnsignedLong(light&0xFF)<<56;
+    }
+
     public void setStateCallback(Consumer<StateEntry> stateCallback) {
         this.newStateCallback = stateCallback;
     }
diff --git a/src/main/java/me/cortex/voxy/commonImpl/importers/DHImporter.java b/src/main/java/me/cortex/voxy/commonImpl/importers/DHImporter.java
index e203ac0a..ad57399f 100644
--- a/src/main/java/me/cortex/voxy/commonImpl/importers/DHImporter.java
+++ b/src/main/java/me/cortex/voxy/commonImpl/importers/DHImporter.java
@@ -291,10 +291,12 @@ public class DHImporter implements IDataImporter {
                     //    int a = 0;
                     //}
                     //Insert all entries into data cache
-                    for (int y = startY; y < endY; y++) {
-                        int idx = Integer.expand(y, 0b11111111_00_1111_0000_0000) | bPos;
-                        storage[idx] = mEntry;
-
+                    startY = Integer.expand(startY, 0b11111111_00_1111_0000_0000);
+                    endY = Integer.expand(endY, 0b11111111_00_1111_0000_0000);
+                    final int Msk = 0b11111111_00_1111_0000_0000;
+                    final int iMsk1 = (~Msk)+1;
+                    for (int y = startY; y != endY; y = (y+iMsk1)&Msk) {
+                        storage[y+bPos] = mEntry;
                         //touched[(idx >>> 12)>>6] |= 1L<<(idx&0x3f);
                     }
                 }