diff --git a/extra/perf.sh b/extra/perf.sh
index 2d79552..5357019 100644
--- a/extra/perf.sh
+++ b/extra/perf.sh
@@ -15,6 +15,7 @@ echo
 # tex-fmt
 TEXFMTFILE="hyperfine-tex-fmt.csv"
 hyperfine --warmup 10 \
+    --min-runs 50 \
     --export-csv $TEXFMTFILE \
     --command-name "tex-fmt" \
     --prepare "cp -r ../tests/* $DIR" \
diff --git a/src/main.rs b/src/main.rs
index 83369b3..df95abd 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -50,7 +50,7 @@ fn main() {
                     "File is not correctly formatted.".to_string(),
                 );
                 exit_code = 1;
-            } else {
+            } else if text != new_text {
                 write_file(file, &new_text);
             }
         } else {