diff --git a/bundles/postgresql/files/postgresql.conf b/bundles/postgresql/files/postgresql.conf
index 56fa5af..7bcbe10 100644
--- a/bundles/postgresql/files/postgresql.conf
+++ b/bundles/postgresql/files/postgresql.conf
@@ -9,6 +9,7 @@ max_connections = ${max_connections}
 autovacuum_max_workers = ${autovacuum_max_workers}
 maintenance_work_mem = ${maintenance_work_mem}MB
 work_mem = ${work_mem}MB
+effective_cache_size = ${cache_size}MB
 shared_buffers = ${shared_buffers}MB
 temp_buffers = ${temp_buffers}MB
 log_destination = syslog
diff --git a/bundles/postgresql/metadata.py b/bundles/postgresql/metadata.py
index fce9bb6..46b6718 100644
--- a/bundles/postgresql/metadata.py
+++ b/bundles/postgresql/metadata.py
@@ -24,6 +24,7 @@ defaults = {
         'shared_buffers': 128,
         'temp_buffers': 8,
         'slow_query_log_sec': 0,
+        'cache_size': 256,
     },
 }
 
diff --git a/nodes/htz-cloud.afra.toml b/nodes/htz-cloud.afra.toml
index 5345ebb..14ef4b6 100644
--- a/nodes/htz-cloud.afra.toml
+++ b/nodes/htz-cloud.afra.toml
@@ -77,6 +77,8 @@ target = "http://127.0.0.1:20100/"
 
 [metadata.postgresql]
 version = "15"
+work_mem = 1024
+cache_size = 2048
 
 [[metadata.zfs.pools.tank.when_creating.config]]
 devices = ["/dev/disk/by-id/scsi-0HC_Volume_32207877"]
diff --git a/nodes/rx300.py b/nodes/rx300.py
index dd189d3..96dbd8f 100644
--- a/nodes/rx300.py
+++ b/nodes/rx300.py
@@ -475,6 +475,10 @@ nodes['rx300'] = {
         'postgresql': {
             'version': '13',
             'max_connections': 500,
+            'autovacuum_max_workers': 12,
+            'maintenance_work_mem': 2*1024,
+            'work_mem': 8*1024,
+            'cache_size': 32*1024,
         },
         'radicale': {
             'domain': 'radicale.franzi.business',
@@ -563,7 +567,7 @@ nodes['rx300'] = {
         },
         'zfs': {
             'module_options': {
-                'zfs_arc_max_gb': 16,
+                'zfs_arc_max_gb': 48,
             },
             'pools': {
                 'tank': {