diff --git a/backfiller/backfiller/main.py b/backfiller/backfiller/main.py
index bec75a7..cb51ede 100644
--- a/backfiller/backfiller/main.py
+++ b/backfiller/backfiller/main.py
@@ -16,6 +16,7 @@ import argh
 import gevent.backdoor
 import gevent.pool
 import prometheus_client as prom
+from requests.adapters import HTTPAdapter
 
 import common
 from common import dateutil
@@ -23,8 +24,10 @@ from common import database
 from common.requests import InstrumentedSession
 from common.segments import list_segment_files, unpadded_b64_decode
 
-# Wraps all requests in some metric collection
+# Wraps all requests in some metric collection and connection pooling
 requests = InstrumentedSession()
+adapter = HTTPAdapter(pool_maxsize=100)
+requests.mount('https://', adapter)
 
 segments_backfilled = prom.Counter(
 	'segments_backfilled',
diff --git a/downloader/downloader/main.py b/downloader/downloader/main.py
index f36d70b..5186945 100644
--- a/downloader/downloader/main.py
+++ b/downloader/downloader/main.py
@@ -15,6 +15,7 @@ import gevent.backdoor
 import gevent.event
 import prometheus_client as prom
 import requests
+import requests.adapters
 from monotonic import monotonic
 
 import common
@@ -335,6 +336,8 @@ class StreamWorker(object):
 		# This worker's SegmentGetters will use its session by default for performance,
 		# but will fall back to a new one if something goes wrong.
 		self.session = common.requests.InstrumentedSession()
+		adapter = requests.adapters.HTTPAdapter(pool_maxsize=100)
+		self.session.mount('https://', adapter)
 		# Map cache is a simple cache to avoid re-downloading the same map URI for every segment,
 		# since it's generally the same but may occasionally change.
 		# We expect the map data to be very small so there is no eviction here.