Mysql 5.5 taking too much time to execute.

[sirajudeen j]

Hi all,
We were using MySql 5.1.Now we have upgraded to MySql 5.5.
In mysql 5.5,queries taking too much time to execute compared to mysql 5.1.At the same time i was trying to execute same query continuously in 5.5.Very first time data will be fetching from db.Second and third times data comes from buffer pool.So retrieval will be speed.But in mysql 5.5 query execution time was approximately same for all times.Shall i know the reason