TPSUtil.java

    private static Object minecraftServer;
    private static Field recentTps;

    public static double[] getRecentTps() {
        try {
            if (minecraftServer == null) {
                Server server = Bukkit.getServer();
                Field consoleField = server.getClass().getDeclaredField("console");
                consoleField.setAccessible(true);
                minecraftServer = consoleField.get(server);
            }
            if (recentTps == null) {
                recentTps = minecraftServer.getClass().getSuperclass().getDeclaredField("recentTps");
                recentTps.setAccessible(true);
            }
            return (double[]) recentTps.get(minecraftServer);
        } catch (IllegalAccessException | NoSuchFieldException ignored) {
        }
        return new double[] {20, 20, 20};
    }

Why do you return {20,20,20} when the only way to get to that code is if there is an error? Shouldn't you return {-1,-1,-1} or just let the exception go? Returning {20,20,20} would indicate to the caller that the server is running optimally, when in fact we have no idea.

What information does that array include exactly?