amazon-rds amazon-web-services full-text-search mysql

MySQL Full text search extremely slow on a AWS RDS large instance

I have a table having 14 million rows and i am trying to perform a full text search on this table. The query for this is performing really slow, it is taking around 9 seconds for a simple binary AND query. The same stuff executes instantly on my private cluster. Size of this table is around 3.1 GB and it contains 14 million rows. Can someone explain this behavior of RDS instance?

SELECT count(*) 
FROM table_name WHERE id=97
AND match(body) against ('+data +big' IN BOOLEAN MODE)