SceneManager.LoadScene is slow

hello people,

I use this code to load a new scene:
SceneManager.LoadScene(1, LoadSceneMode.Single);

However the game freezes and takes 10 to 15 seconds to load out this new scene :confused:
Can someone help me please?

We deny using scenes.
We use prefabs to load different levels in one scene. Previous level we delete by deleting the corresponding GameObject from scene.

My friend told me that SceneManager is heavy.
Is not there any way to reverse this?

Ps: The staff here from the forum tend to ignore novice doubts?
Most of the experienced people do not even care about the posts from here?

I have the same issue, how did you resolve it? Any suggestion will be highly appreciated.,I have the same issue, how did you resolve it? Any suggestion?

exactly what Iā€™m getting! blank for at least 10 seconds
4.7 is blazing fast, 2017 onwards is a cow
did you figure out how to speed it up?