Open Source Fast Use - Forge Ready - FunTime Bypass

    private static final Set<Item> items = Collections.unmodifiableSet(
            new HashSet<>(Arrays.asList(
                    Items.EXPERIENCE_BOTTLE,
                    Items.SPLASH_POTION
            ))
    );

    private static final int delay = 4;
    private int useTime = 0;
  
    @SubscribeEvent
    public void onPlayerTick(TickEvent.PlayerTickEvent event) {
        if (event.phase != TickEvent.Phase.START || !this.isEnabled() || mc.player == null) {
            return;
        }

        PlayerEntity player = mc.player;
        ItemStack heldItem = player.getMainHandItem();

        if (items.contains(heldItem.getItem()) && mc.options.keyUse.isDown()) {
            if (useTime == 0) {
                mc.gameMode.useItem(player, player.level, Hand.MAIN_HAND);
            }
            useTime++;

            if (useTime >= delay) {
                mc.gameMode.releaseUsingItem(player);
                useTime = 0;
            }
        } else {
            useTime = 0;
        }
    }