By acrosman on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
8.0.x
Issue links: 
https://www.drupal.org/node/2474047
Description: 

Removed a Timer call from the core's DrupalKernel startup process to improve performance.

Before

Drupal 8 core created a timer during page startup to help with debugging and support the devel module.

After

Timer has been removed to improve performance.
To provide this is similar functionality a boot event subscriber or stack middle ware can be implemented instead.

Notes

KernelEvents::REQUEST occurs significantly later in the request and could obscure observable numbers by up to 50%

Impacts: 
Module developers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Other updates done