Efficient/Lag-free way of setting a biome?

Hello,

I'm currently working on a SkyBlock server and especially on the "/is biome" command which sets the player's island biome.

This is currently my code, even though as of 1.20 there's been a new command called "fillbiome" in vanilla minecraft, so I'm not sure if a more efficient way of setting a biome is available.

I'm using Spigot 1.20.4.

Code:

    public static void setIslandBiome(Player p, String b) {
        SkyPlayer sp = SkyPlayer.getSkyPlayer(p);

        double x_start = sp.getX_start();
        double x_end = sp.getX_end();
        double z_start = sp.getZ_start();
        double z_end = sp.getZ_end();

        for (double x = x_start; x <= x_end; x++) {
            for (double z = z_start; z <= z_end; z++) {
                for (int y = 0; y <= 319; y++) {
                    Location loc = new Location(EleoPlugin.skyWorld, x, y, z);
                    World w = loc.getWorld();
                    if (w == null)
                        return;
                    Biome biome;
                    switch (b) {
                        case "snow" -> biome = Biome.SNOWY_TAIGA;
                        case "desert" -> biome = Biome.DESERT;
                        case "savanna" -> biome = Biome.SAVANNA;
                        default -> biome = Biome.PLAINS;
                    }
                    w.setBiome(loc, biome);
                }
            }
        }
        p.sendMessage(Utility.serverPrefix("island") + "Successfully set biome. Re-log in order to see the changes!");
    }