Minecraft lag in chunks loading

Please don't report as dupligated, because it's not, it's another type of lag that I'm describing. I still notice lag chunks loading after 1.16.2, also under the suggested render distance (12 and i set to 10), at around 6-8 looks pretty ok, but is the half SUGGESTED render distance. I wanna to specify that I'm using an iPad with a M2 chip... pretty fast, no? Still lag... with or without resource packs. I'm on the 1.21.2