[INFRA] Mesure performance impacts of 'fit on load'

[tbouffard]

Is your feature request related to a problem? Please describe. In #775, it is possible to change the diagram rendering when loading to make it fit the viewport. We know that double rendering is performed (1st with BPMN diagram dimensions, then a new one to fit, see #840) and we are pretty sure that for large diagram, this will provide a degraded user example (load time).

Describe the solution you'd like Find a way to measure the 'fit on load' overhead and collect figures to know for what kind of BPMN diagrams (number and types of BPMN elements) the double rendering is a pain. This will let us know if implementing improvements is urgent or not.