Lag in Drag and drop and conrtol over the model in THREE .js

I’m creating a model where there are multiple boxes loaded as goods.
when there was 10 boxes i could easily drag and drop the objects rotate pan do everything very smoothly.
but now when there there sooo many boxes as shown in the model,
I’m actually getting a delay.when i click on the object and try to drag and drop it responds after 8 -10 secs.
Also the controls used for rotate pan zoom are not working as expected.
i can see a lag.
Did anyone face this kind of issue.
Can someone please suggest me how to handle this

Thanks in advance :slight_smile:

Please demonstrate this performance issue with a live example.