luau/bench/micro_tests/test_TableInsertion_index_cached.lua

local bench = script and require(script.Parent.bench_support) or require("bench_support")

function test()

    local ts0 = os.clock()

    for i=1,300 do
        local t = {}
        for j=1,1000 do
            t[j] = j
        end
    end

    local ts1 = os.clock()

    return ts1-ts0
end

bench.runCode(test, "TableInsertion: t[i]")