Scale maximum number of curls up according to work submission rate.

cgminer.c

@@ -2219,8 +2219,15 @@ static void recruit_curl(struct pool *pool)
  * network delays/outages. */
 static struct curl_ent *pop_curl_entry(struct pool *pool)
 {
-	int curl_limit = opt_delaynet ? 5 : mining_threads * 4 / 3;
 	struct curl_ent *ce;
+	int curl_limit;
+
+	if (!opt_delaynet) {
+		double work_util = total_diff1 / total_secs * 60;
+
+		curl_limit =  (mining_threads + work_util) * 4 / 3;
+	} else
+		curl_limit = 5;
 
 	mutex_lock(&pool->pool_lock);
 retry: