Java mget is much slower than http mget when in high concurrency environment

Hi, when i test the performance of mget method with HP Loadrunning, i found that java's mget method is much slower than http's mget method, java's mget method is almost 5 times slower than http's mget method.

here is my test method.

MultiGetResponse multiGetResponse = client.prepareMultiGet() .add(index, type, ids) .execute() .actionGet();

curl -XGET '' -d '{
"ids" : ["1", "2", "3", ...]

But the weird thing is that i send a single request respectively, their average time spent is the same.

you can also see the issue in here.