Allays on leads cause lag

I had about a dozen Allays on leads tied to a fence post. In the chunks they were loaded, eating and sleeping took over twice as long to do, items dropped slowly, blocks mined slowly. But fps didn’t drop much. As soon as they were released, the slow motion stopped. https://share.icloud.com/photos/059ZFtsApRpf-Xjdbauquf3Bg