diff --git a/dev/ofunctions.sh b/dev/ofunctions.sh
index 506de3a..08958e0 100644
--- a/dev/ofunctions.sh
+++ b/dev/ofunctions.sh
@@ -31,7 +31,7 @@
 #### OFUNCTIONS MINI SUBSET ####
 #### OFUNCTIONS MICRO SUBSET ####
 _OFUNCTIONS_VERSION=2.3.0-dev-postRC2
-_OFUNCTIONS_BUILD=2019080904
+_OFUNCTIONS_BUILD=2019081401
 #### _OFUNCTIONS_BOOTSTRAP SUBSET ####
 _OFUNCTIONS_BOOTSTRAP=true
 #### _OFUNCTIONS_BOOTSTRAP SUBSET END ####
@@ -57,7 +57,7 @@ _LOGGER_VERBOSE=false
 _LOGGER_ERR_ONLY=false
 _LOGGER_PREFIX="date"
 if [ "$KEEP_LOGGING" == "" ]; then
-	KEEP_LOGGING=1801
+	KEEP_LOGGING=30
 fi
 
 # Initial error status, logging 'WARN', 'ERROR' or 'CRITICAL' will enable alerts flags
@@ -2021,6 +2021,11 @@ function PreInit {
 		SSH_OPTS="$SSH_OPTS -o ControlMaster=auto -o ControlPersist=yes -o ControlPath=\"$RUN_DIR/$PROGRAM.ctrlm.%r@%h.$SCRIPT_PID.$TSTAMP\""
 	fi
 
+	## Optional SSH arguments
+	if [ "$SSH_OPTIONAL_ARGS" != "" ]; then
+		SSH_OPTS="$SSH_OPTS $SSH_OPTIONAL_ARGS"
+	fi
+
 	## Support for older config files without RSYNC_EXECUTABLE option
 	if [ "$RSYNC_EXECUTABLE" == "" ]; then
 		RSYNC_EXECUTABLE=rsync
diff --git a/sync.conf.example b/sync.conf.example
index 625ad94..07fe71d 100644
--- a/sync.conf.example
+++ b/sync.conf.example
@@ -64,9 +64,15 @@ PATH_SEPARATOR_CHAR=";"
 
 [REMOTE_OPTIONS]
 
-## ssh compression should be used unless your remote connection is good enough (LAN)
+## ssh compression should be used on WAN links, unless your remote connection is good enough (LAN), in which case it would slow down things
 SSH_COMPRESSION=true
 
+## Optional ssh options. Example to lower CPU usage on ssh compression, one can specify '-T -c arcfour -o Compression=no -x'
+## -T = turn off pseudo-tty, -c arcfour = weakest but fasted ssh encryption (destination must accept "Ciphers arcfour" in sshd_config), -x turns off X11 forwarding
+## arcfour isn't accepted on most newer systems, you may then prefer any AES encryption if processor has aes-ni hardware acceleration
+## Uncomment the following line to use those optimizations, on secured links only
+#SSH_OPTIONAL_ARGS="-T -c aes128-ctr -o Compression=no -x"
+
 ## Ignore ssh known hosts. DANGER WILL ROBINSON DANGER ! This can lead to security issues. Only enable this if you know what you're doing.
 SSH_IGNORE_KNOWN_HOSTS=false