diff --git a/internal/download/downloader.go b/internal/download/downloader.go
index d04f7bc..e9a3b44 100644
--- a/internal/download/downloader.go
+++ b/internal/download/downloader.go
@@ -246,7 +246,7 @@ func (d *Downloader) file(ctx context.Context, sourceURL, outputPath string, all
 			)
 			defer bar.SetTotal(-1, true)
 		}
-		buf := make([]byte, 256*1024)
+		buf := make([]byte, downloadBufferSize)
 		totalWritten := int64(0)
 		for {
 			n, readErr := reader.Read(buf)
@@ -271,7 +271,7 @@ func (d *Downloader) file(ctx context.Context, sourceURL, outputPath string, all
 			return err
 		}
 	} else {
-		written, copyErr := io.Copy(out, reader)
+		written, copyErr := io.CopyBuffer(out, reader, make([]byte, downloadBufferSize))
 		if copyErr != nil {
 			return copyErr
 		}