diff --git a/master/master/lib/slavesensors.c b/master/master/lib/slavesensors.c
--- a/master/master/lib/slavesensors.c
+++ b/master/master/lib/slavesensors.c
@@ -172,7 +172,7 @@ void slavesensors_network_scan() {
 void slavesensors_selectnode(uint8_t nodeIndex)
 {
 	serial0_ioff();
-	
+	uint32_t startTime = time_millis();
 	#ifdef DEBUG_SELECTNODE
 	serial0_sendString("Switch to node ");
 	serial0_sendChar(nodeIndex + 0x30);
@@ -211,6 +211,10 @@ void slavesensors_selectnode(uint8_t nod
 	serial0_sendString("\r\n");
 	#endif
 	
+	uint32_t switchTime = time_millis() - startTime;
+	char tmpB[32];
+	snprintf(tmpB, 32, "CTXSW: %lu ms\r\n", switchTime);
+	serial0_sendString(tmpB);
 	serial0_ion();
 	return;
 }