diff --git a/tap_appsflyer/__init__.py b/tap_appsflyer/__init__.py
index e4d8b4f..692c93a 100644
--- a/tap_appsflyer/__init__.py
+++ b/tap_appsflyer/__init__.py
@@ -271,25 +271,16 @@ def sync_installs():
 
     next(reader) # Skip the heading row
 
-    # AppsFlyer returns records in order of most recent first. So, we
-    # need to reverse them in order to provide sensible STATE
-    # checkpoints.  According to the API documentation, there may be
-    # as many as 200,000 rows here but I don't have a better solution.
-    rows = []
-    for row in reader:
-        rows.append(row)
-    rows = reversed(rows)
-
-    # Emit updated records with state checkpoint
-    for i, row in enumerate(rows):
+    bookmark = from_datetime
+    for i, row in enumerate(reader):
         record = xform(row, schema)
         singer.write_record("installs", record)
-        utils.update_state(STATE, "installs", record["attributed_touch_time"])
+        # AppsFlyer returns records in order of most recent first.
+        if utils.strptime(record["attributed_touch_time"]) > bookmark:
+            bookmark = utils.strptime(record["attributed_touch_time"])
 
-        if (i % 250) == 0:
-            singer.write_state(STATE)
-
-    # Write out final state
+    # Write out state
+    utils.update_state(STATE, "installs", bookmark)
     singer.write_state(STATE)
 
 
@@ -407,25 +398,17 @@ def sync_in_app_events():
 
     next(reader) # Skip the heading row
 
-    # AppsFlyer returns records in order of most recent first. So, we
-    # need to reverse them in order to provide sensible STATE
-    # checkpoints.  According to the API documentation, there may be
-    # as many as 200,000 rows here but I don't have a better solution.
-    rows = []
-    for row in reader:
-        rows.append(row)
-    rows = reversed(rows)
-
-    # Emit updated records with state checkpoint
-    for i, row in enumerate(rows):
+    bookmark = from_datetime
+    for i, row in enumerate(reader):
         record = xform(row, schema)
         singer.write_record("in_app_events", record)
-        utils.update_state(STATE, "in_app_events", record["event_time"])  # NOTE: This is different in each report
-
-        if (i % 250) == 0:
-            singer.write_state(STATE)
+        # AppsFlyer returns records in order of most recent first.
+        if utils.strptime(record["event_time"]) > bookmark:
+            LOGGER.info("replacing bookmark!")
+            bookmark = utils.strptime(record["event_time"])
 
-    # Write out final state
+    # Write out state
+    utils.update_state(STATE, "in_app_events", bookmark)
     singer.write_state(STATE)