diff --git a/hub/common.py b/hub/common.py
index 4376663..6579d6f 100644
--- a/hub/common.py
+++ b/hub/common.py
@@ -1,4 +1,5 @@
 import struct
+import asyncio
 import hashlib
 import hmac
 import ipaddress
@@ -766,3 +767,11 @@ def expand_result(results):
     if inner_hits:
         return expand_result(inner_hits)
     return expanded
+
+
+async def asyncify_for_loop(gen, ticks_per_sleep: int = 1000):
+    async_sleep = asyncio.sleep
+    for cnt, item in enumerate(gen):
+        yield item
+        if cnt % ticks_per_sleep == 0:
+            await async_sleep(0)
diff --git a/hub/herald/session.py b/hub/herald/session.py
index 6c5159e..ef0ed51 100644
--- a/hub/herald/session.py
+++ b/hub/herald/session.py
@@ -22,7 +22,8 @@ from hub.herald import PROTOCOL_MIN, PROTOCOL_MAX, HUB_PROTOCOL_VERSION
 from hub.build_info import BUILD, COMMIT_HASH, DOCKER_TAG
 from hub.herald.search import SearchIndex
 from hub.common import sha256, hash_to_hex_str, hex_str_to_hash, HASHX_LEN, version_string, formatted_time, SIZE_BUCKETS
-from hub.common import protocol_version, RPCError, DaemonError, TaskGroup, HISTOGRAM_BUCKETS, LRUCache, LRUCacheWithMetrics
+from hub.common import protocol_version, RPCError, DaemonError, TaskGroup, HISTOGRAM_BUCKETS
+from hub.common import LRUCache, LRUCacheWithMetrics, asyncify_for_loop
 from hub.herald.jsonrpc import JSONRPCAutoDetect, JSONRPCConnection, JSONRPCv2, JSONRPC
 from hub.herald.common import BatchRequest, ProtocolError, Request, Batch, Notification
 from hub.herald.framer import NewlineFramer
@@ -204,8 +205,8 @@ class SessionManager:
             elastic_host=env.elastic_host, elastic_port=env.elastic_port
         )
         self.running = False
-        self.hashX_history_cache = LRUCache(2 ** 14)
-        self.hashX_full_cache = LRUCache(2 ** 12)
+        self.hashX_history_cache = LRUCacheWithMetrics(2 ** 14, metric_name='raw_history', namespace=NAMESPACE)
+        self.hashX_full_cache = LRUCacheWithMetrics(2 ** 12, metric_name='full_history', namespace=NAMESPACE)
         self.history_tx_info_cache = LRUCacheWithMetrics(2 ** 18, metric_name='history_tx', namespace=NAMESPACE)
 
     def clear_caches(self):
@@ -1463,8 +1464,11 @@ class LBRYElectrumX(asyncio.Protocol):
     async def confirmed_and_unconfirmed_history(self, hashX):
         # Note history is ordered but unconfirmed is unordered in e-s
         history = await self.session_manager.limited_history(hashX)
-        conf = [{'tx_hash': txid, 'height': height}
-                for txid, height in history]
+        conf = [
+            item async for item in asyncify_for_loop(
+                ({'tx_hash': txid, 'height': height} for txid, height in history), 1000
+            )
+        ]
         return conf + self.unconfirmed_history(hashX)
 
     async def scripthash_get_history(self, scripthash):