diff --git a/roles/unbound/templates/unbound.conf.dna-gw01.home.foo.sh.j2 b/roles/unbound/templates/unbound.conf.dna-gw01.home.foo.sh.j2
index 1479483..9cd96f8 100644
--- a/roles/unbound/templates/unbound.conf.dna-gw01.home.foo.sh.j2
+++ b/roles/unbound/templates/unbound.conf.dna-gw01.home.foo.sh.j2
@@ -1,4 +1,11 @@
 server:
+    # https://nlnetlabs.nl/documentation/unbound/howto-optimise/
+    num-threads: {{ ansible_processor_cores }}
+    msg-cache-slabs: {{ ansible_processor_cores | int | pow(2) | int }}
+    rrset-cache-slabs: {{ ansible_processor_cores | int | pow(2) | int }}
+    infra-cache-slabs: {{ ansible_processor_cores | int | pow(2) | int }}
+    key-cache-slabs: {{ ansible_processor_cores | int | pow(2) | int }}
+
     interface: 172.20.20.10@53
     interface: 172.20.20.10@853
     interface: 172.20.21.1@53
diff --git a/roles/unbound/templates/unbound.conf.dna-gw02.home.foo.sh.j2 b/roles/unbound/templates/unbound.conf.dna-gw02.home.foo.sh.j2
index c2f67ef..de8a3d4 100644
--- a/roles/unbound/templates/unbound.conf.dna-gw02.home.foo.sh.j2
+++ b/roles/unbound/templates/unbound.conf.dna-gw02.home.foo.sh.j2
@@ -1,4 +1,11 @@
 server:
+    # https://nlnetlabs.nl/documentation/unbound/howto-optimise/
+    num-threads: {{ ansible_processor_cores }}
+    msg-cache-slabs: {{ ansible_processor_cores | int | pow(2) | int }}
+    rrset-cache-slabs: {{ ansible_processor_cores | int | pow(2) | int }}
+    infra-cache-slabs: {{ ansible_processor_cores | int | pow(2) | int }}
+    key-cache-slabs: {{ ansible_processor_cores | int | pow(2) | int }}
+
     interface: 172.20.20.10@53
     interface: 172.20.20.10@853
     interface: 172.20.21.2@53