api/search/lookup api too slow

[Grace Lee]

Hello.

I am trying to retrieve all metrics name for a specific host  using /search/lookup api.

But It takes time 7~9 seconds until return the data from opentsdb.

How can I reduce response time?

API ---

curl --data '{"userMeta":false, "tags":[{"key": "pm_ip", "value":"1.1.1.1"}]}' -H "Content-Type:application/json; charset:UTF-8" "http://10.1.1.2:9090/api/search/lookup"

Thank you in advance.