Question wanna fix freezing when instantiating

A problem occurred while creating a non-game program in Unity.
When certain conditions occur, we need to instantiate a prefab like the image below during runtime.
However, this prefab is quite heavy and the game freezes for a while until it finishes loading.

Is there any way to instantiate a heavy prefab in Unity without stopping for a while?

Object pooling techniques are not suitable. For memory management, only one prefab like the one below should appear.