Zaggle: optimizing Mandelbrot

So i was taking my waggle project (a tiny graphics lib that depends on MiniFB only, didn’t go too far) to Zig (zaggle) I had a Mandelbrot example, thought’d be a great thing to optimize. The underlying implementations are not really changed, so performance should be similar. But what I got when benchmarking was this: (data from waggle are labled with c_, while zaggle is not labeled; baseline for naively iterating, 4thrd for tiling 4 thread implementation, 4async for tiling 4 std.Io.async ...