You can turn on devel mysql log to see if you which queries are taking too long. You can also turn on the mysql slow query log in your mysql my.cnf file. Once you do you can see which query is taking too long, you can move on to optimizing it.
I suspect you are using views for this page. If that's the case, check the views filters. Try to add proper filtering on index columns from the node table. Or any other index column. In addition to that, check to see you have mysql cache enabled.

You could turn on the devel mysql log to see which queries are taking too long to execute. You can also turn on the mysql slow query log in your mysql my.cnf file.

I suspect you are using views for this page. If that's the case, check the views filters. Try to add proper filtering on index columns from the node table. Or any other index column. In addition to that, check to see you have mysql cache enabled.