I'm aware about cocoonjs update:
MEMORY MANAGEMENT
Improved memory management features: image disposal, max memory threshold, max memory warning event and lazy loading.
http://blog.ludei.com/techniques-to-opt ... vironment/
I haven't tested my complex games on CocoonJS, I guess it will be same without dependency such as dispose(); or boolean “cocoonLazyLoadâ€, I don't think it's going to help everyone.