diff --git a/web/public/css/iblogs.css b/web/public/css/iblogs.css
index fa34159..7753b70 100644
--- a/web/public/css/iblogs.css
+++ b/web/public/css/iblogs.css
@@ -950,6 +950,24 @@ main {
     width: 100%;
 }
 
+/*
+ * Skip layout / paint of off-screen log cells until they scroll into
+ * view. With logs running up to ~25 000 entries the eager render of
+ * every cell is what causes the multi-second freeze on initial load.
+ *
+ * `.entry` itself is `display: contents` (no box), so the rule has to
+ * land on the actual grid items it produces. `contain-intrinsic-size:
+ * auto 1.5em` lets the browser remember measured heights after first
+ * paint and falls back to ~one line tall as the placeholder for
+ * never-seen cells. Multi-line stack traces correct on first pass; the
+ * scroll position adjusts once.
+ */
+.log-inner .line-number-container,
+.log-inner .line-content {
+    content-visibility: auto;
+    contain-intrinsic-size: auto 1.5em;
+}
+
 .log-inner .entry.entry-error .line-content,
 .log-inner .entry.entry-error .line-number-container{
     background-color: var(--error-bg);