diff --git a/marginalia_nu/src/main/java/nu/marginalia/util/multimap/MultimapFileLong.java b/marginalia_nu/src/main/java/nu/marginalia/util/multimap/MultimapFileLong.java
index 061c9ed9..251b2c30 100644
--- a/marginalia_nu/src/main/java/nu/marginalia/util/multimap/MultimapFileLong.java
+++ b/marginalia_nu/src/main/java/nu/marginalia/util/multimap/MultimapFileLong.java
@@ -124,14 +124,22 @@ public class MultimapFileLong implements AutoCloseable, MultimapFileLongSlice {
         if (endLongs >= mappedSize)
             grow(endLongs);
 
-        var buff = mappedByteBuffers.get((int)(startLongs / bufferSize));
 
-        if ((int)(startLongs / bufferSize) != (int)((endLongs) / bufferSize)) {
-            logger.debug("Misaligned madvise, skipping");
-            return;
+        int startIdx = (int)(startLongs / bufferSize);
+        int endIdx = (int)(endLongs / bufferSize);
+
+        if (startIdx != endIdx) {
+            long offsetStart = (startLongs % bufferSize) * WORD_SIZE;
+            NativeIO.madviseRange(mappedByteBuffers.get(startIdx), advice, offsetStart, (int) (bufferSize * WORD_SIZE - offsetStart));
+            for (int i = startIdx+1; i < endIdx; i++) {
+                NativeIO.madviseRange(mappedByteBuffers.get(i), advice, 0, (int)(bufferSize * WORD_SIZE));
+            }
+            NativeIO.madviseRange(mappedByteBuffers.get(endIdx), advice, 0, (int)((endIdx % bufferSize) * WORD_SIZE));
+        }
+        else {
+            var buff = mappedByteBuffers.get(startIdx);
+            NativeIO.madviseRange(buff, advice, (startLongs % bufferSize) * WORD_SIZE, (int) (lengthLongs * WORD_SIZE));
         }
-
-        NativeIO.madviseRange(buff, advice, (startLongs % bufferSize) * WORD_SIZE, (int)(lengthLongs*WORD_SIZE));
     }
 
     public void pokeRange(long offset, long length) {
diff --git a/marginalia_nu/src/main/java/nu/marginalia/wmsa/edge/index/conversion/SearchIndexPreconverter.java b/marginalia_nu/src/main/java/nu/marginalia/wmsa/edge/index/conversion/SearchIndexPreconverter.java
index 5357fc1f..d096ff0e 100644
--- a/marginalia_nu/src/main/java/nu/marginalia/wmsa/edge/index/conversion/SearchIndexPreconverter.java
+++ b/marginalia_nu/src/main/java/nu/marginalia/wmsa/edge/index/conversion/SearchIndexPreconverter.java
@@ -17,19 +17,7 @@ import java.nio.file.Files;
 import java.util.Objects;
 
 public class SearchIndexPreconverter {
-    private static final int CHUNK_HEADER_SIZE = 16;
-
     private final Logger logger = LoggerFactory.getLogger(getClass());
-    private final SearchIndexPartitioner partitioner;
-    private final TIntHashSet spamDomains;
-
-    @SneakyThrows
-    public static long wordCount(File inputFile) {
-        try (RandomAccessFile raf = new RandomAccessFile(inputFile, "r")) {
-            raf.readLong();
-            return raf.readInt();
-        }
-    }
 
     @SneakyThrows
     @Inject
@@ -38,8 +26,7 @@ public class SearchIndexPreconverter {
                                    SearchIndexPartitioner partitioner,
                                    EdgeDomainBlacklist blacklist)
     {
-        this.partitioner = partitioner;
-        this.spamDomains = blacklist.getSpamDomains();
+        TIntHashSet spamDomains = blacklist.getSpamDomains();
         logger.info("Preconverting {}", inputFile);
 
         for (File f : outputFiles) {
@@ -64,12 +51,10 @@ public class SearchIndexPreconverter {
             fileChannels[i] = randomAccessFiles[i].getChannel();
         }
 
-
         var lock = partitioner.getReadLock();
         try {
             lock.lock();
             ByteBuffer buffer = ByteBuffer.allocateDirect(8192);
-
             for (var entry : indexJournalReader) {
                 if (!partitioner.isGoodUrl(entry.urlId())
                     || spamDomains.contains(entry.domainId())) {
@@ -93,6 +78,7 @@ public class SearchIndexPreconverter {
         finally {
             lock.unlock();
         }
+        logger.info("Finalizing preconversion");
 
         for (int i = 0; i < randomAccessFiles.length; i++) {
             long pos = randomAccessFiles[i].getFilePointer();
diff --git a/marginalia_nu/src/main/java/nu/marginalia/wmsa/edge/index/model/IndexBlock.java b/marginalia_nu/src/main/java/nu/marginalia/wmsa/edge/index/model/IndexBlock.java
index 14a654d9..73e733a5 100644
--- a/marginalia_nu/src/main/java/nu/marginalia/wmsa/edge/index/model/IndexBlock.java
+++ b/marginalia_nu/src/main/java/nu/marginalia/wmsa/edge/index/model/IndexBlock.java
@@ -11,6 +11,7 @@ public enum IndexBlock {
     Meta(7, 7),
     PositionWords(8, 4.5),
     NamesWords(9, 5),
+    Unused(10, 10),
     Topic(11, 0.5);
 
     public final int id;
@@ -19,7 +20,6 @@ public enum IndexBlock {
     IndexBlock(int id, double sortOrder) {
         this.sortOrder = sortOrder;
         this.id = id;
-
     }
 
     public static IndexBlock byId(int id) {
diff --git a/marginalia_nu/src/main/java/nu/marginalia/wmsa/edge/index/reader/SearchIndex.java b/marginalia_nu/src/main/java/nu/marginalia/wmsa/edge/index/reader/SearchIndex.java
index ac33b139..c2888f7a 100644
--- a/marginalia_nu/src/main/java/nu/marginalia/wmsa/edge/index/reader/SearchIndex.java
+++ b/marginalia_nu/src/main/java/nu/marginalia/wmsa/edge/index/reader/SearchIndex.java
@@ -46,17 +46,14 @@ public class SearchIndex implements  AutoCloseable {
 
     private void madvise(MultimapFileLong urls, BTreeReader reader) {
 
-        urls.advice(NativeIO.Advice.Random);
         words.forEachWordsOffset(offset -> {
             var h = reader.getHeader(offset);
             long length = h.dataOffsetLongs() - h.indexOffsetLongs();
 
-            urls.adviceRange(NativeIO.Advice.Normal, offset, 512);
+            urls.adviceRange(NativeIO.Advice.WillNeed, offset, 512);
 
             if (length > 0) {
                 urls.adviceRange(NativeIO.Advice.WillNeed, h.indexOffsetLongs(), length);
-                urls.adviceRange(NativeIO.Advice.Normal, h.dataOffsetLongs(), Math.min(2048, h.numEntries()*bTreeReader.ctx.entrySize()));
-                urls.pokeRange(h.indexOffsetLongs(), length);
             }
         });
     }