Improve syncing of big accounts: add caching, increase timeout

conf/homeserver.yaml

@@ -498,6 +498,33 @@ database:
 #
 #event_cache_size: 10K
 
+caches:
+  # Controls the global cache factor, which is the default cache factor
+  # for all caches if a specific factor for that cache is not otherwise
+  # set.
+  #
+  # This can also be set by the "SYNAPSE_CACHE_FACTOR" environment
+  # variable. Setting by environment variable takes priority over
+  # setting through the config file.
+  #
+  # Defaults to 0.5, which will half the size of all caches.
+  #
+  # global_factor: 2.0
+
+  # Controls how long an entry can be in a cache without having been
+  # accessed before being evicted. Defaults to None, which means
+  # entries are never evicted based on time.
+  #
+  # expiry_time: 120m
+
+  # Controls how long the results of a /sync request are cached for after
+  # a successful response is returned. A higher duration can help clients with
+  # intermittent connections, at the cost of higher memory usage.
+  #
+  # By default, this is zero, which means that sync responses are not cached
+  # at all.
+  #
+  sync_response_cache_duration: 15m
 
 ## Logging ##
 

conf/nginx.conf

@@ -6,6 +6,11 @@ location __PATH__ {
 
         client_max_body_size 100M;
 
+        # Use longer timeouts for the sync API
+        location __PATH__/client/r0/sync {
+            proxy_read_timeout 7m;
+        }
+
         # Use the specific path for the php file. It's more secure than global php path
         location __PATH__/cas_server.php {
             alias /var/www/__APP__/;