Query for Transactions per second?
It's a bit clunky, but this should give you the tps since restart of MySQL:

SELECT  SUM(IF(variable_name IN ('Com_commit', 'Com_rollback'),
                   variable_value, 0)) /
        SUM(IF(variable_name = 'Uptime',
                   variable_value, 0))
    FROM  information_schema.GLOBAL_STATUS