It is meaningless to ask about latency or TCP or UDP throughput. They are totally dependent on the networks and communicating devices. However some general comments on the design of MIPv6:
The main benefits of MIPv6 are security, handover efficiency and route optimisation. The benefits of route optimisation, which has the most significant benefits for throughput and latency, are discussed in detail in the RFC 4651:
http://www.rfc-base.org/txt/rfc-4651.txt
The specific benefits are highly dependent on the location of the HN and MN.