Drop bottom segments properly. Set Brotli Optimum = Fastest.

src/ZoneTree/Compression/BrotliDataCompression.cs

@@ -6,6 +6,10 @@ public static class BrotliDataCompression
 {
     public static byte[] Compress(Span<byte> span, int level)
     {
+        /// Brotli Optimum level is extremely slow.
+        /// Changing the optimum level to fastest!
+        if (level == 0)
+            level = 1;
         using var msOutput = new MemoryStream();
         using var gzs = new BrotliStream(msOutput, (CompressionLevel)level, false);
         gzs.Write(span);

src/ZoneTree/Core/ZoneTree.cs

@@ -227,7 +227,7 @@ public sealed partial class ZoneTree<TKey, TValue> : IZoneTree<TKey, TValue>, IZ
         foreach (var ros in readOnlySegments)
             ros.Drop();
         foreach (var bs in BottomSegmentQueue.ToArray())
-            bs.ReleaseResources();
+            bs.Drop();
         Options.WriteAheadLogProvider.DropStore();
         Options.RandomAccessDeviceManager.DropStore();
     }