_start = os.clock()
for i=1,4096,1 do
	minetest.register_craftitem(
		"benchmark_clear_craft:item_" .. tostring(i),
		{
			description = "item_" .. tostring(i)
		}
	)
end
_end = os.clock()
minetest.debug(
	"time to register 4096 craftitems: " .. tostring(_end - _start)
)

_start = os.clock()
for i=1,4096,1 do
	minetest.register_craft({
		output = "benchmark_clear_craft:item_" .. tostring(i),
		type = "shapeless",
		recipe = { "benchmark_clear_craft:item_" .. tostring(i) }
	})
end
_end = os.clock()
minetest.debug(
	"time to register 4096 crafts: " .. tostring(_end - _start)
)

_start = os.clock()
for i=1,2048,1 do
	minetest.clear_craft({
		output = "benchmark_clear_craft:item_" .. tostring(i),
	})
end
_end = os.clock()
minetest.debug(
	"time to clear 2048 crafts based on output: " .. tostring(_end - _start)
)
_start = os.clock()
for i=2049,4096,1 do
	minetest.clear_craft({
		type = "shapeless",
		recipe = { "benchmark_clear_craft:item_" .. tostring(i) }
	})
end
_end = os.clock()
minetest.debug(
	"time to clear 2048 crafts based on recipe: " .. tostring(_end - _start)
)

--[[
2022-05-12 23:22:26: [Main]: time to register 4096 craftitems: 0.066811
2022-05-12 23:22:26: [Main]: time to register 4096 crafts: 0.065608
2022-05-12 23:22:26: [Main]: time to clear 2048 crafts based on output: 0.01529
2022-05-12 23:22:53: [Main]: time to clear 2048 crafts based on recipe: 24.10416
]]--