Speeding up bpmn-js

I use bpmn-js Library to paint the BPMN diagram in my application. The Process we have a huge one though we have some parent child decomposition done. The problem is this bpmn-js take a long time to load the main process. how can I speed up this?

https://forum.bpmn.io/ is the appropritate forum for bpmn-js-related questions.