Trying to make parts not fall through the map on the server

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1

My game uses chunks to generate terrain, but it does that on the client. This means the server cannot see the terrain and all the parts/models will fall through. I made the code and it works but there is 1 issue, the chunks get destroyed and created repeatedly resulting in massive fps lag. I tried many solutions but they did not help. Here’s my code:

local Chunk = require(game.ReplicatedStorage.Chunk)

local RENDER_DISTANCE = 1
local CHUNKS_LOADED_PER_TICK = 1
local LOAD_CHUNKS_FREQUENCY = 0
local chunks = {}
local chunkCount = 0
local fastLoad = true

local function chunkWait()
	chunkCount = (chunkCount + 1) % CHUNKS_LOADED_PER_TICK
	if chunkCount == 0 and not fastLoad then
		wait()
	end
end

local function doesChunkExist(x, z)
	for index, chunk in pairs(chunks) do
		if chunk.x == x and chunk.z == z then
			return true
		end
	end

	return false
end

local function isChunkOutOfRange(chunk, centerPosX, centerPosZ)
	if math.abs(chunk.x - centerPosX) > RENDER_DISTANCE
		or math.abs(chunk.z - centerPosZ) > RENDER_DISTANCE then
		return true
	end

	return false
end

while true do
	for _, v in pairs(workspace:GetDescendants()) do
		if v:IsA("BasePart") then
			if v.Parent then
				if v.Parent:IsA("Model") then
					if not game.Players:GetPlayerFromCharacter(v.Parent) then
						local centerPosX
						local centerPosZ

						local camPos = v.CFrame.Position

						centerPosX = math.floor(camPos.X / Chunk.WIDTH_SIZE_X)
						centerPosZ = math.floor(camPos.Z / Chunk.WIDTH_SIZE_Z)

						local n = #chunks

						for i = 1, n do
							local chunk = chunks[i]

							if isChunkOutOfRange(chunk, centerPosX, centerPosZ) then
								print("destroyed")
								chunk:Destroy()
								chunkWait()

								chunks[i] = nil
							end
						end

						local j = 0
						for i = 1, n do
							if chunks[i] ~= nil then
								j += 1
								chunks[j] = chunks[i]
							end
						end

						for i = j + 1, n do
							chunks[i] = nil
						end

						for x = centerPosX - RENDER_DISTANCE, centerPosX + RENDER_DISTANCE do
							for z = centerPosZ - RENDER_DISTANCE, centerPosZ + RENDER_DISTANCE do
								if not doesChunkExist(x, z) then
									table.insert(chunks, Chunk.new(x, z))
									print("created")
									chunkWait()
								end
							end
						end
					end
				elseif v.Parent == workspace then
					local centerPosX
					local centerPosZ

					local camPos = v.CFrame.Position

					centerPosX = math.floor(camPos.X / Chunk.WIDTH_SIZE_X)
					centerPosZ = math.floor(camPos.Z / Chunk.WIDTH_SIZE_Z)

					local n = #chunks

					for i = 1, n do
						local chunk = chunks[i]

						if isChunkOutOfRange(chunk, centerPosX, centerPosZ) then
							print("destroyed")
							chunk:Destroy()
							chunkWait()

							chunks[i] = nil
						end
					end

					local j = 0
					for i = 1, n do
						if chunks[i] ~= nil then
							j += 1
							chunks[j] = chunks[i]
						end
					end

					for i = j + 1, n do
						chunks[i] = nil
					end

					for x = centerPosX - RENDER_DISTANCE, centerPosX + RENDER_DISTANCE do
						for z = centerPosZ - RENDER_DISTANCE, centerPosZ + RENDER_DISTANCE do
							if not doesChunkExist(x, z) then
								table.insert(chunks, Chunk.new(x, z))
								print("created")
								chunkWait()
							end
						end
					end
				end
			end
		end
	end
	
	fastLoad = false
	wait(LOAD_CHUNKS_FREQUENCY)
end
2

I want to ask why we are generating the chunks on the client and not the server just telling the client what to load where

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