Events.java

if(!event.isCanceled() && event.getType() == RenderGameOverlayEvent.ElementType.HELMET){
            int posX = (event.getWindow().getScaledWidth()) / 2;
            int posY = (event.getWindow().getScaledHeight()) / 2;
            PlayerEntity entity = Minecraft.getInstance().player;
            World world = entity.world;
            double x = entity.getPosX();
            double y = entity.getPosY();
            double z = entity.getPosZ();
            Vector3d vec = entity.getMotion();
            Color color = new ColorUIResource(16, 146, 158);

            double speed = Math.sqrt(Math.pow(vec.x, 2) + Math.pow(vec.y, 2) + Math.pow(vec.z, 2))*20;
            if(speeds.size() >= 5){
                speeds.remove(0);
                speeds.add(speed);
            }else{
                speeds.add(speed);
            }
            System.out.println(speed);
            speed = 0;
            for(int i = 0; i < speeds.size(); i++){
                speed += speeds.get(i);
            }
            speed = speed/speeds.size();


            if (true) {

                Minecraft.getInstance().fontRenderer.drawString(event.getMatrixStack(), String.format("%.2f", speed)+" Blocks/s", (event.getWindow().getScaledWidth())-50, event.getWindow().getScaledHeight()-50, color.getRGB());
            }

        }