chunk loading takes for a long time

*When i load a world and/or enter the nether/end portal,going back to overworld make long chunk loading.I was waiting for 5 minutes and still not appear,I try to change my render distance and still not work.I still waiting and the chunk loaded.
my render distance is 16 and my fps is 10 then i change the render distance to 2 and (change) my fps to 60.when i open the chunk border i see like a chunk pillar