The stuff in do_DHT only need to be run once per second.

Should lower CPU usage by a bit.

toxcore/DHT.c

@@ -1662,11 +1662,14 @@ DHT *new_DHT(Net_Crypto *c)
 void do_DHT(DHT *dht)
 {
     unix_time_update();
-
+    if (dht->last_run == unix_time()) {
+        return;
+    }
     do_Close(dht);
     do_DHT_friends(dht);
     do_NAT(dht);
     do_toping(dht->ping);
+    dht->last_run = unix_time();
 }
 void kill_DHT(DHT *dht)
 {

toxcore/DHT.h

@@ -149,6 +149,8 @@ typedef struct {
     PING        *ping;
 
     Assoc       *assoc;
+
+    uint64_t    last_run;
 } DHT;
 /*----------------------------------------------------------------------------------*/