There have been reports of procedure editor being slow and crashing with big procedure layouts.
The current workaround is to split procedures into smaller pieces and use a call procedure block to link them.
We are considering switching to the Chromium web engine which would speed up procedure editor and remove size constraints.
The problem with Chromium is that it would increase the install size of MCreator for 150 - 200 MB and that there are some incompatibility issues at the moment, but we are working on them.
This ticket is for user input on the change and to track the progress.