Hi,
Here is a Unity forum thread about that issue:
https://forum.unity.com/threads/loading-updatepreloading-taking-up-precious-time-for-no-reason.252578/
It's a long thread, but it seems that it's a long running issue that can be avoided by commenting calls to Resources.UnloadUnusedAssets().
Also, someone said that it might happen only in the editor, but I would advise you to make sure of that yourself by profiling a build.
Let me know if that solved the issue.
Have a nice day
Here is a Unity forum thread about that issue:
https://forum.unity.com/threads/loading-updatepreloading-taking-up-precious-time-for-no-reason.252578/
It's a long thread, but it seems that it's a long running issue that can be avoided by commenting calls to Resources.UnloadUnusedAssets().
Also, someone said that it might happen only in the editor, but I would advise you to make sure of that yourself by profiling a build.
Let me know if that solved the issue.
Have a nice day
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