add a set of optimization techniques

Author: arunoda

Diff for: optimizations.md

@@ -0,0 +1,10 @@
+# Use the current balancer as the endpoint
+
+* If the picked endpoint is a balancer, use the current selected balancer.
+* For that, we need to send balancer when picking up the endpoint hash
+* then if the endpoint is equal to current endpoint, simply return false
+
+# Use CPU based balancing
+
+* synchronize CPU usage accross instances
+* balance accordingly