diff --git a/pom.xml b/pom.xml
index f08fade..a4d9651 100644
--- a/pom.xml
+++ b/pom.xml
@@ -14,7 +14,7 @@
 		<dbengine.ci>false</dbengine.ci>
 		<micrometer.version>1.9.5</micrometer.version>
 		<lucene.version>9.5.0</lucene.version>
-    <rocksdb.version>7.9.2</rocksdb.version>
+    <rocksdb.version>7.10.2</rocksdb.version>
 		<junit.jupiter.version>5.9.0</junit.jupiter.version>
     <data.generator.version>1.0.258</data.generator.version>
 	</properties>
diff --git a/src/main/java/it/cavallium/dbengine/client/query/QueryUtils.java b/src/main/java/it/cavallium/dbengine/client/query/QueryUtils.java
index be7a47b..28294e3 100644
--- a/src/main/java/it/cavallium/dbengine/client/query/QueryUtils.java
+++ b/src/main/java/it/cavallium/dbengine/client/query/QueryUtils.java
@@ -1,5 +1,7 @@
 package it.cavallium.dbengine.client.query;
 
+import static it.cavallium.dbengine.database.LLUtils.mapList;
+
 import it.cavallium.dbengine.client.query.current.data.BooleanQuery;
 import it.cavallium.dbengine.client.query.current.data.BooleanQueryPart;
 import it.cavallium.dbengine.client.query.current.data.Occur;
@@ -86,11 +88,7 @@ public class QueryUtils {
 		}
 		org.apache.lucene.search.SynonymQuery synonymQuery = (org.apache.lucene.search.SynonymQuery) luceneQuery;
 		return SynonymQuery.of(field,
-				synonymQuery
-						.getTerms()
-						.stream()
-						.map(term -> TermAndBoost.of(QueryParser.toQueryTerm(term), 1))
-						.toList()
+				mapList(synonymQuery.getTerms(), term -> TermAndBoost.of(QueryParser.toQueryTerm(term), 1))
 		);
 	}
 }
diff --git a/src/main/java/it/cavallium/dbengine/database/LLMultiLuceneIndex.java b/src/main/java/it/cavallium/dbengine/database/LLMultiLuceneIndex.java
index db83960..e17da25 100644
--- a/src/main/java/it/cavallium/dbengine/database/LLMultiLuceneIndex.java
+++ b/src/main/java/it/cavallium/dbengine/database/LLMultiLuceneIndex.java
@@ -1,5 +1,6 @@
 package it.cavallium.dbengine.database;
 
+import static it.cavallium.dbengine.database.LLUtils.mapList;
 import static it.cavallium.dbengine.lucene.LuceneUtils.getLuceneIndexId;
 import static it.cavallium.dbengine.utils.StreamUtils.LUCENE_SCHEDULER;
 import static it.cavallium.dbengine.utils.StreamUtils.collect;
@@ -174,11 +175,11 @@ public class LLMultiLuceneIndex implements LLLuceneIndex {
 			@NotNull List<Query> queries,
 			@Nullable Query normalizationQuery,
 			BucketParams bucketParams) {
-		return mergeShards(luceneIndicesSet.stream().map(luceneIndex -> luceneIndex.computeBuckets(snapshot,
+		return mergeShards(mapList(luceneIndicesSet, luceneIndex -> luceneIndex.computeBuckets(snapshot,
 				queries,
 				normalizationQuery,
 				bucketParams
-		)).toList());
+		)));
 	}
 
 	@Override
diff --git a/src/main/java/it/cavallium/dbengine/database/LLUtils.java b/src/main/java/it/cavallium/dbengine/database/LLUtils.java
index 96e74a4..b745f6a 100644
--- a/src/main/java/it/cavallium/dbengine/database/LLUtils.java
+++ b/src/main/java/it/cavallium/dbengine/database/LLUtils.java
@@ -513,30 +513,6 @@ public class LLUtils {
 		return Buf.copyOf(array);
 	}
 
-
-	public static Buf compositeBuffer(Buf buffer) {
-		return buffer;
-	}
-
-	@NotNull
-	public static Buf compositeBuffer(Buf buffer1, Buf buffer2) {
-		// todo: create a composite buffer without allocating a new array
-		var out = Buf.create(buffer1.size() + buffer2.size());
-		out.addAll(buffer1);
-		out.addAll(buffer2);
-		return out;
-	}
-
-	@NotNull
-	public static Buf compositeBuffer(Buf buffer1, Buf buffer2, Buf buffer3) {
-		// todo: create a composite buffer without allocating a new array
-		var out = Buf.create(buffer1.size() + buffer2.size());
-		out.addAll(buffer1);
-		out.addAll(buffer2);
-		out.addAll(buffer3);
-		return out;
-	}
-
 	public static <T> T resolveDelta(Delta<T> delta, UpdateReturnMode updateReturnMode) {
 		return switch (updateReturnMode) {
 			case GET_NEW_VALUE -> delta.current();
@@ -666,9 +642,10 @@ public class LLUtils {
 		}
 	}
 
-	public static <T, U> List<U> mapList(List<T> input, Function<T, U> mapper) {
-		//todo: optimize hits mapping
-		return input.stream().map(mapper).toList();
+	public static <T, U> List<U> mapList(Collection<T> input, Function<T, U> mapper) {
+		var result = new ArrayList<U>(input.size());
+		input.forEach(t -> result.add(mapper.apply(t)));
+		return result;
 	}
 
 	private static class FakeBytesRefBuilder extends BytesRefBuilder {
diff --git a/src/main/java/it/cavallium/dbengine/database/disk/LLLocalDictionary.java b/src/main/java/it/cavallium/dbengine/database/disk/LLLocalDictionary.java
index 844c7e5..f483b31 100644
--- a/src/main/java/it/cavallium/dbengine/database/disk/LLLocalDictionary.java
+++ b/src/main/java/it/cavallium/dbengine/database/disk/LLLocalDictionary.java
@@ -3,6 +3,7 @@ package it.cavallium.dbengine.database.disk;
 import static it.cavallium.dbengine.database.LLUtils.ALLOW_STATIC_OPTIONS;
 import static it.cavallium.dbengine.database.LLUtils.MARKER_ROCKSDB;
 import static it.cavallium.dbengine.database.LLUtils.isBoundedRange;
+import static it.cavallium.dbengine.database.LLUtils.mapList;
 import static it.cavallium.dbengine.database.LLUtils.toStringSafe;
 import static it.cavallium.dbengine.database.disk.UpdateAtomicResultMode.DELTA;
 import static it.cavallium.dbengine.utils.StreamUtils.LUCENE_SCHEDULER;
@@ -542,7 +543,7 @@ public class LLLocalDictionary implements LLDictionary {
 						{
 							var readOptions = generateReadOptionsOrStatic(null);
 							try {
-								var inputs = db.multiGetAsList(readOptions, Lists.transform(keyBufsWindow, Buf::asArray));
+								var inputs = db.multiGetAsList(readOptions, mapList(keyBufsWindow, Buf::asArray));
 								mappedInputs = new ArrayList<>(inputs.size());
 								for (int i = 0; i < inputs.size(); i++) {
 									var val = inputs.get(i);
diff --git a/src/main/java/it/cavallium/dbengine/database/disk/LLLocalKeyValueDatabase.java b/src/main/java/it/cavallium/dbengine/database/disk/LLLocalKeyValueDatabase.java
index f80e8ac..63f1627 100644
--- a/src/main/java/it/cavallium/dbengine/database/disk/LLLocalKeyValueDatabase.java
+++ b/src/main/java/it/cavallium/dbengine/database/disk/LLLocalKeyValueDatabase.java
@@ -1,6 +1,7 @@
 package it.cavallium.dbengine.database.disk;
 
 import static it.cavallium.dbengine.database.LLUtils.MARKER_ROCKSDB;
+import static it.cavallium.dbengine.database.LLUtils.mapList;
 import static it.cavallium.dbengine.utils.StreamUtils.collect;
 import static it.cavallium.dbengine.utils.StreamUtils.iterating;
 import static java.lang.Boolean.parseBoolean;
@@ -276,11 +277,7 @@ public class LLLocalKeyValueDatabase extends Backuppable implements LLKeyValueDa
 					columnFamilyOptions.setBottommostCompressionType(lastLevelOptions.compressionType);
 					columnFamilyOptions.setBottommostCompressionOptions(lastLevelOptions.compressionOptions);
 
-					columnFamilyOptions.setCompressionPerLevel(columnOptions
-							.levels()
-							.stream()
-							.map(v -> v.compression().getType())
-							.toList());
+					columnFamilyOptions.setCompressionPerLevel(mapList(columnOptions.levels(), v -> v.compression().getType()));
 				} else {
 					columnFamilyOptions.setNumLevels(7);
 					List<CompressionType> compressionTypes = new ArrayList<>(7);
@@ -932,10 +929,9 @@ public class LLLocalKeyValueDatabase extends Backuppable implements LLKeyValueDa
 
 			requireNonNull(databasesDirPath);
 			requireNonNull(path.getFileName());
-			List<DbPath> paths = convertPaths(databasesDirPath, path.getFileName(), databaseOptions.volumes())
-					.stream()
-					.map(p -> new DbPath(p.path, p.targetSize))
-					.toList();
+			List<DbPath> paths = mapList(convertPaths(databasesDirPath, path.getFileName(), databaseOptions.volumes()),
+					p -> new DbPath(p.path, p.targetSize)
+			);
 			options.setDbPaths(paths);
 			options.setMaxOpenFiles(databaseOptions.maxOpenFiles().orElse(-1));
 			if (databaseOptions.spinning()) {
diff --git a/src/main/java/it/cavallium/dbengine/lucene/collector/FastFacetsCollectorManager.java b/src/main/java/it/cavallium/dbengine/lucene/collector/FastFacetsCollectorManager.java
index 3af0e54..b4436ac 100644
--- a/src/main/java/it/cavallium/dbengine/lucene/collector/FastFacetsCollectorManager.java
+++ b/src/main/java/it/cavallium/dbengine/lucene/collector/FastFacetsCollectorManager.java
@@ -1,5 +1,7 @@
 package it.cavallium.dbengine.lucene.collector;
 
+import static it.cavallium.dbengine.database.LLUtils.mapList;
+
 import it.cavallium.dbengine.lucene.IntSmear;
 import it.unimi.dsi.fastutil.ints.IntHash;
 import java.io.IOException;
@@ -31,10 +33,9 @@ public class FastFacetsCollectorManager implements CollectorManager<FacetsCollec
 
 	@Override
 	public FacetsCollector reduce(Collection<FacetsCollector> collectors) throws IOException {
-		return FacetsCollector.wrap(facetsCollectorManager.reduce(collectors
-				.stream()
-				.map(facetsCollector -> facetsCollector.getLuceneFacetsCollector())
-				.toList()));
+		return FacetsCollector.wrap(facetsCollectorManager.reduce(mapList(collectors,
+				facetsCollector -> facetsCollector.getLuceneFacetsCollector()
+		)));
 	}
 
 	private static class FastFacetsCollector implements FacetsCollector {
diff --git a/src/main/java/it/cavallium/dbengine/lucene/searcher/CountMultiSearcher.java b/src/main/java/it/cavallium/dbengine/lucene/searcher/CountMultiSearcher.java
index 95097f6..b8b4184 100644
--- a/src/main/java/it/cavallium/dbengine/lucene/searcher/CountMultiSearcher.java
+++ b/src/main/java/it/cavallium/dbengine/lucene/searcher/CountMultiSearcher.java
@@ -1,5 +1,7 @@
 package it.cavallium.dbengine.lucene.searcher;
 
+import static it.cavallium.dbengine.database.LLUtils.mapList;
+
 import it.cavallium.dbengine.client.query.current.data.TotalHitsCount;
 import it.cavallium.dbengine.database.LLKeyScore;
 import it.cavallium.dbengine.database.LLUtils;
@@ -39,16 +41,9 @@ public class CountMultiSearcher implements MultiSearcher {
 					"Scored queries are not supported by SimpleUnsortedUnscoredLuceneMultiSearcher");
 		}
 
-		var results = indexSearchers
-				.llShards()
-				.stream()
-				.map(searcher -> this.collect(searcher,
-						queryParams,
-						keyFieldName,
-						transformer,
-						f -> filterer.apply(f).limit(0)
-				))
-				.toList();
+		var results = mapList(indexSearchers.llShards(),
+				searcher -> this.collect(searcher, queryParams, keyFieldName, transformer, f -> filterer.apply(f).limit(0))
+		);
 		boolean exactTotalHitsCount = true;
 		long totalHitsCountValue = 0;
 		for (LuceneSearchResult result : results) {
diff --git a/src/main/java/it/cavallium/dbengine/lucene/searcher/StandardSearcher.java b/src/main/java/it/cavallium/dbengine/lucene/searcher/StandardSearcher.java
index d1a6313..50770cc 100644
--- a/src/main/java/it/cavallium/dbengine/lucene/searcher/StandardSearcher.java
+++ b/src/main/java/it/cavallium/dbengine/lucene/searcher/StandardSearcher.java
@@ -1,5 +1,6 @@
 package it.cavallium.dbengine.lucene.searcher;
 
+import static it.cavallium.dbengine.database.LLUtils.mapList;
 import static it.cavallium.dbengine.utils.StreamUtils.toList;
 import static java.util.Objects.requireNonNull;
 
@@ -64,7 +65,7 @@ public class StandardSearcher implements MultiSearcher {
 			sharedManager = TopScoreDocCollector.createSharedManager(queryParams.limitInt(), null, totalHitsThreshold);
 		}
 		;
-		var collectors = indexSearchers.stream().map(shard -> {
+		var collectors = mapList(indexSearchers, shard -> {
 			try {
 				TopDocsCollector<?> collector;
 				collector = sharedManager.newCollector();
@@ -77,7 +78,7 @@ public class StandardSearcher implements MultiSearcher {
 			} catch (IOException e) {
 				throw new DBException(e);
 			}
-		}).toList();
+		});
 
 		try {
 			if (collectors.size() <= 1) {