Couple of things: Make sure the configured bandwidth corresponds to the uplink. In other words based on what you say you configured, make sure that the MPLS connection is indeed connected to WAN 2 and the slower connection to WAN 1. Might also want to make the MPLS connection the primary one. Also activate load balancing (unless you specifically want to reserve the MPLS for certain applications). Perhaps you could also lower the list update interval, but I don't think that that will have much impact. Play around with the per-client bandwidth limit to make sure it's not just a single user hogging up all bandwidth. And lastly, you may want to take a look into trafic shaping, because your links are not fast, so you would benefit a lot from it. At least try the default shaping rules.
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