diff --git a/script.js b/script.js
index 95cdcc6..0df594e 100644
--- a/script.js
+++ b/script.js
@@ -53,12 +53,16 @@ Array.from(firstByLetter.entries())
   });
 
 const searchInput = document.getElementById("toc-search");
+let searchTimeout;
 searchInput?.addEventListener("input", (event) => {
-  const query = event.target.value.trim().toLowerCase();
-  Array.from(tocList?.querySelectorAll("li") ?? []).forEach((item) => {
-    const text = item.textContent.toLowerCase();
-    item.style.display = text.includes(query) ? "" : "none";
-  });
+  clearTimeout(searchTimeout);
+  searchTimeout = setTimeout(() => {
+    const query = event.target.value.trim().toLowerCase();
+    Array.from(tocList?.querySelectorAll("li") ?? []).forEach((item) => {
+      const text = item.textContent.toLowerCase();
+      item.style.display = text.includes(query) ? "" : "none";
+    });
+  }, 150);
 });
 
 // OCR/formatting errors from epub conversion