fix tests

Author: KSemenenko

README.md

@@ -178,7 +178,7 @@ var crc = Crc32Helper.CalculateFileCrc(local.FilePath);
 logger.LogInformation("Backup CRC for {File} is {Crc}", fileName, crc);
 ```
 
-The test suite includes end-to-end scenarios that mirror payloads between Azure, AWS, the local file system, and virtual file systems; multi-gigabyte flows execute by default across every provider using 64 MB units per "GB" to keep runs fast while still exercising streaming paths.
+The test suite includes end-to-end scenarios that mirror payloads between Azure, AWS, the local file system, and virtual file systems; multi-gigabyte flows execute by default across every provider using 4 MB units per "GB" to keep runs fast while still exercising streaming paths.
 
 ## ASP.NET Controllers & SignalR Streaming
 

Tests/ManagedCode.Storage.Tests/Common/LargeFileTestHelper.cs

@@ -17,7 +17,7 @@ public static class LargeFileTestHelper
     /// Base unit (in bytes) used when synthesising large-file test payloads. Keeps runtime manageable while
     /// exercising multi-chunk flows across transports. Equivalent to 64 MB.
     /// </summary>
-    public const long LargeFileUnitBytes = 16L * 1024L * 1024L;
+    public const long LargeFileUnitBytes = 4L * 1024L * 1024L;
 
     /// <summary>
     /// Resolves the byte-length used for a given "gigabyte" unit in large file tests. The multiplier keeps