diff --git a/app/web/static/compare.js b/app/web/static/compare.js
index 50f9d02..9af134c 100644
--- a/app/web/static/compare.js
+++ b/app/web/static/compare.js
@@ -485,7 +485,7 @@ async function main() {
     const tb = framesOf(panels.b);
     return Math.max(ta, tb, 2);
   }
-  function baseMsPerFrame() { return 400 / parseFloat(speedSel.value || '1'); }
+  function baseMsPerFrame() { return 1600 / parseFloat(speedSel.value || '1'); }
 
   function tick(ts) {
     requestAnimationFrame(tick);
diff --git a/app/web/templates/compare.html b/app/web/templates/compare.html
index c36c336..0248110 100644
--- a/app/web/templates/compare.html
+++ b/app/web/templates/compare.html
@@ -111,6 +111,6 @@
 </section>
 
 <script src="/static/theme.js?v=11"></script>
-<script type="module" src="/static/compare.js?v=2"></script>
+<script type="module" src="/static/compare.js?v=3"></script>
 </body>
 </html>