diff --git a/hdiff-any-game/checker.go b/hdiff-any-game/checker.go
index 8fd99ce..78fce31 100644
--- a/hdiff-any-game/checker.go
+++ b/hdiff-any-game/checker.go
@@ -30,12 +30,10 @@ func safePartialMD5(path string) (string, error) {
 		return "", err
 	}
 	size := fi.Size()
-	modTime := fi.ModTime().UnixNano()
 
 	h := md5.New()
 
 	binary.Write(h, binary.LittleEndian, size)
-	binary.Write(h, binary.LittleEndian, modTime)
 	binary.Write(h, binary.LittleEndian, fi.Mode())
 
 	buf := make([]byte, 4096)
@@ -99,9 +97,7 @@ func DiffFolders(oldPath, newPath string) (*DiffResult, error) {
 	workers := runtime.NumCPU() * 2
 
 	for i := 0; i < workers; i++ {
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
+		wg.Go(func() {
 			for job := range jobs {
 				rel, oldFile, newFile := job[0], job[1], job[2]
 				oldHash, _ := safePartialMD5(oldFile)
@@ -113,7 +109,7 @@ func DiffFolders(oldPath, newPath string) (*DiffResult, error) {
 				}
 				bar.Add(1)
 			}
-		}()
+		})
 	}
 
 	for rel, oldFile := range oldFiles {
diff --git a/hdiff-any-game/makeHdiffFile.go b/hdiff-any-game/makeHdiffFile.go
index 79df36c..8598e37 100644
--- a/hdiff-any-game/makeHdiffFile.go
+++ b/hdiff-any-game/makeHdiffFile.go
@@ -16,18 +16,18 @@ type HdiffFile struct {
 }
 
 func MakeHdiffFile(oldPath string, newPath string, changedFiles []string) error {
-	delFile, err := os.Create("hdiff/hdifffiles.txt")
+	diffFile, err := os.Create("hdiff/hdifffiles.txt")
 	if err != nil {
 		return err
 	}
-	defer delFile.Close()
+	defer diffFile.Close()
 
 	for _, f := range changedFiles {
 		data, err := json.Marshal(HdiffFile{RemoteName: f})
 		if err != nil {
 			return err
 		}
-		fmt.Fprintln(delFile, string(data))
+		fmt.Fprintln(diffFile, string(data))
 	}
 
 	bar := progressbar.NewOptions(len(changedFiles),
@@ -37,10 +37,8 @@ func MakeHdiffFile(oldPath string, newPath string, changedFiles []string) error
 		progressbar.OptionSetPredictTime(true),
 	)
 
-	workers := runtime.NumCPU() / 2
-	if workers < 2 {
-		workers = 2
-	}
+	workers := runtime.NumCPU()
+	
 	jobs := make(chan string, len(changedFiles))
 	var wg sync.WaitGroup
 
diff --git a/hdiff-any-game/utils.go b/hdiff-any-game/utils.go
index 445af6f..8a652fa 100644
--- a/hdiff-any-game/utils.go
+++ b/hdiff-any-game/utils.go
@@ -104,7 +104,7 @@ func ZipWith7za(src, dest string) error {
 		return err
 	}
 
-	args := []string{"a", "-tzip", "-mx=1", "-mmt=on", destAbs}
+	args := []string{"a", "-tzip", "-mx=3", "-mmt=on", destAbs}
 	for _, f := range files {
 		args = append(args, f.Name())
 	}