We are missing key data in order to identify performance issues, the following pieces of information should be added and/or documented:

Frontend

• log the time taken by the layout
• Log the time taken by some core components of our representations (tree, form, diagram, table) using the React profiler

Backend

• log time of each event handler
• log time of the IEditingContext{Persistence|Search}Service
• log time of each IRepresentationEventProcessor#refresh
• log time (with a threshold) of the evaluation of AQL expressions (log all expressions taking more than 50ms for example)
• log the time taken by each datafetcher using GraphQL Java instrumentation support

All this should be done with some easy to use configuration properties on the backend (to start debugging everything easily)