Hey ;)
There are indeed many tools.
I recommend using the free nanoprofiler from the marketplace https://marketplace.mendix.com/link/component/118285?ste_sid=e50c513df04e5b5955ee5bdd71bece64
With this tool you can measure at runtime the execution time of the microflows in your application. Also, it's lightweight so it does not affect the existing performance of the system (Compared with tools like APD from ClevR which do slow a bit the execution of the queries by attempting to measure them)
There's also https://marketplace.mendix.com/link/component/236183 -- Ciphix performance monitoring tool which I am less familiar with but I will try.
Also you can look for "WARNING - ConnectionBus_Queries: Query executed in" type of logs in your cloud environment. These will show your SQL query execution and it's execution time.