added performance test for clusters
added performance test for clusters

cfraz89/ObjectMapper,goodwall/ObjectMapper,Hearst-DD/ObjectMapper,cfraz89/ObjectMapper,tonyli508/ObjectMapperDeep,ken0nek/ObjectMapper,Busta117/ObjectMapper,ikesyo/ObjectMapper,Hearst-DD/ObjectMapper,tonyli508/ObjectMapperDeep,ken0nek/ObjectMapper,ikesyo/ObjectMapper,goodwall/ObjectMapper,Busta117/ObjectMapper