diff --git a/swh/web/common/origin_visits.py b/swh/web/common/origin_visits.py
--- a/swh/web/common/origin_visits.py
+++ b/swh/web/common/origin_visits.py
@@ -54,8 +54,11 @@
 
     origin_visits = []
 
+    if not cache_entry:
+        last_visit = None
+
     per_page = archive.MAX_LIMIT
-    last_visit = None
+
     while 1:
         visits = list(
             archive.lookup_origin_visits(
@@ -75,7 +78,12 @@
         ts = parse_iso8601_date_to_utc(visit["date"]).timestamp()
         return ts + (float(visit["visit"]) / 10e3)
 
-    origin_visits = sorted(origin_visits, key=lambda v: _visit_sort_key(v))
+    if cache_entry:
+        origin_visits = cache_entry + sorted(
+            origin_visits, key=lambda v: _visit_sort_key(v)
+        )
+    else:
+        origin_visits = sorted(origin_visits, key=lambda v: _visit_sort_key(v))
 
     cache.set(cache_entry_id, origin_visits)