Drupal 6 Track step by step performance / execution time

Drupal 6 site is slow.

Want to track performance / page execution time.
- check each step, PHP code, execution time
- check JavaScript execution time
- check CSS execution time

http://krumo.sourceforge.net
Krumo prints out the function stack, each step/function from bootstrap to the page up.

Could Krumo give information about the execution time of each step?

There are also other tools, such as the following listing:
https://www.drupal.org/project/performance
Performance Logging and Monitoring

https://www.drupal.org/project/xhprof
XHProf

https://www.drupal.org/project/profiling
Profiling

What are the tools / methods to track the step by step performance (execution time)?
drupal_100Asked:
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gheistCommented:
Drupal is very simple tool
Can you check if you have enough system memory on your server
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Aaron FeledyDrupal Developer and ConsultantCommented:
Check out the Devel module. It has features for outputting debug info about execution times and memory usage for each page load.  CSS and Javascript are executed on the browser side, so you'll need to look at the developer tools that may come with your browser or third party plugins that show you this info.
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