diff --git a/src/grammar/tokenizeString.ts b/src/grammar/tokenizeString.ts
index 5524fdc..7ed3399 100644
--- a/src/grammar/tokenizeString.ts
+++ b/src/grammar/tokenizeString.ts
@@ -58,10 +58,10 @@ class TokenizeStringResult {
 		anchorPosition = whileCheckResult.anchorPosition;
 	}
 
-	const startTime = Date.now();
+	const startTime = performanceNow()
 	while (!STOP) {
 		if (timeLimit !== 0) {
-			const elapsedTime = Date.now() - startTime;
+			const elapsedTime = performanceNow() - startTime;
 			if (elapsedTime > timeLimit) {
 				return new TokenizeStringResult(stack, true);
 			}