unity2019.4.8f1 reimport prefab when i modify any code,unity2019.4.8 reimport prefab when i modify any code

my Project is about 75GB,AssetPipeline is Version2

when i modify any code such as add comment and save the file,unity will reimport all prefabs,it will cast about 5 minutës.

i try to switch to AssetPipeline is Version1, but it is useless. ,my Project is about 75GB

when i modify any code such as add comment and save the file，unity will reimport all prefab which has not been modified

i try to switch AssetPipeline to Version1 ，but it is useless。