diff --git a/src/SharpCompress/Archives/ArchiveFactory.Information.Async.cs b/src/SharpCompress/Archives/ArchiveFactory.Information.Async.cs
index c4fd4fa2..cb5b763a 100644
--- a/src/SharpCompress/Archives/ArchiveFactory.Information.Async.cs
+++ b/src/SharpCompress/Archives/ArchiveFactory.Information.Async.cs
@@ -528,6 +528,7 @@ public static partial class ArchiveFactory
             _ => entries.Aggregate(0L, (total, entry) => total + entry.CompressedSize),
         };
 
+    [Zomp.SyncMethodGenerator.CreateSyncVersion]
     private static async ValueTask<(
         ZipArchiveInformation? Information,
         long DeferredSizeEntryCount
@@ -545,7 +546,9 @@ public static partial class ArchiveFactory
         long deferredSizeEntryCount = 0;
         foreach (var entry in entries.OfType<ZipArchiveEntry>())
         {
+#if !SYNC_ONLY
             cancellationToken.ThrowIfCancellationRequested();
+#endif
             var filePart = entry.Parts.OfType<SeekableZipFilePart>().Single();
             if (!filePart.HasDeferredSizes)
             {
diff --git a/src/SharpCompress/Archives/ArchiveFactory.Information.cs b/src/SharpCompress/Archives/ArchiveFactory.Information.cs
index 264e55c9..01a06ed5 100644
--- a/src/SharpCompress/Archives/ArchiveFactory.Information.cs
+++ b/src/SharpCompress/Archives/ArchiveFactory.Information.cs
@@ -387,35 +387,6 @@ public static partial class ArchiveFactory
             ? ArchiveInformationStatus.Complete
             : ArchiveInformationStatus.Partial;
 
-    private static (
-        ZipArchiveInformation? Information,
-        long DeferredSizeEntryCount
-    ) GetZipInformation(bool isZipArchive, IEnumerable<IArchiveEntry> entries)
-    {
-        if (!isZipArchive)
-        {
-            return (null, 0);
-        }
-
-        long deferredSizeEntryCount = 0;
-        foreach (var entry in entries.OfType<ZipArchiveEntry>())
-        {
-            var filePart = entry.Parts.OfType<SeekableZipFilePart>().Single();
-            if (!filePart.HasDeferredSizes)
-            {
-                continue;
-            }
-
-            var localHeader = filePart.GetRawLocalHeader();
-            if (localHeader.CompressedSize == 0 && localHeader.UncompressedSize == 0)
-            {
-                deferredSizeEntryCount++;
-            }
-        }
-
-        return (new ZipArchiveInformation(deferredSizeEntryCount > 0), deferredSizeEntryCount);
-    }
-
     private static (bool IsSolid, long SolidStreamCount) GetSolidInformation(
         IArchive archive,
         IReadOnlyCollection<IArchiveEntry> entries
diff --git a/src/SharpCompress/Common/Zip/SeekableZipFilePart.Async.cs b/src/SharpCompress/Common/Zip/SeekableZipFilePart.Async.cs
index f4ff6799..c81c11ed 100644
--- a/src/SharpCompress/Common/Zip/SeekableZipFilePart.Async.cs
+++ b/src/SharpCompress/Common/Zip/SeekableZipFilePart.Async.cs
@@ -26,6 +26,9 @@ internal partial class SeekableZipFilePart
             .GetLocalHeaderAsync(BaseStream, _directoryEntryHeader)
             .ConfigureAwait(false);
 
-    internal ValueTask<LocalEntryHeader> GetRawLocalHeaderAsync() =>
-        _headerFactory.GetRawLocalHeaderAsync(BaseStream, _directoryEntryHeader);
+    [Zomp.SyncMethodGenerator.CreateSyncVersion]
+    internal async ValueTask<LocalEntryHeader> GetRawLocalHeaderAsync() =>
+        await _headerFactory
+            .GetRawLocalHeaderAsync(BaseStream, _directoryEntryHeader)
+            .ConfigureAwait(false);
 }
diff --git a/src/SharpCompress/Common/Zip/SeekableZipFilePart.cs b/src/SharpCompress/Common/Zip/SeekableZipFilePart.cs
index 166c55b8..baab3218 100644
--- a/src/SharpCompress/Common/Zip/SeekableZipFilePart.cs
+++ b/src/SharpCompress/Common/Zip/SeekableZipFilePart.cs
@@ -22,9 +22,6 @@ internal partial class SeekableZipFilePart : ZipFilePart
         _directoryEntryHeader = header;
     }
 
-    internal LocalEntryHeader GetRawLocalHeader() =>
-        _headerFactory.GetRawLocalHeader(BaseStream, _directoryEntryHeader);
-
     internal bool HasDeferredSizes =>
         FlagUtility.HasFlag(_directoryEntryHeader.Flags, HeaderFlags.UsePostDataDescriptor);