NoSlow - Sn0w

Overview

NoSlow removes or reduces movement slowdown effects from various Minecraft actions, allowing you to maintain full mobility while using items, navigating through webs, accessing inventories, and more. Description: Prevents you from getting slowed from various actions

NoSlow Modes

Vanilla

Basic slowdown removal with no bypass techniques. Best for: Single player, servers without anti-cheat, or servers with disabled slowdown checks

Grim

GrimAC anti-cheat bypass using offhand packet manipulation. How it works:

Detects when using item in main hand
Sends fake PlayerInteractItemC2SPacket for offhand
Uses server-side rotation from RotationManager
Only applies when not riding or flying
Automatically skips offhand items

Limitations:

Only works for main hand items
Offhand items will still slow you down
Requires not sneaking

Location: NoSlow.java:128-139, 164-166

Grim mode is designed specifically for servers running GrimAC anti-cheat. It may not work on other anti-cheat systems.

Meow

Advanced timing-based bypass. How it works:

Only allows movement during specific use time windows
Movement allowed when: useTimeLeft < 5 OR (useTime > 1 AND useTime % 2 != 0)
Optional rotate fix for inventory interactions

Settings:

Rotate Fix - Close inventory after certain actions (default: false)

Best for: Servers with sophisticated timing checks Location: NoSlow.java:168-169

Strict

NoCheatPlus bypass using packet manipulation. Techniques:

Item Use: Sends slot update packet on every movement
Inventory Movement: Temporarily releases sneak/sprint, sends position packet, then restores state

How Inventory Bypass Works:

Releases shift if sneaking
Stops sprint if sprinting
Sends position packet with +0.0656 Y offset
Only works when on ground with clearance above
Restores sneak/sprint after action

Location: NoSlow.java:185-227

Strict mode’s inventory bypass requires being on ground with no block above. It will not work when jumping or in tight spaces.

Feature Toggles

Items

Controls whether NoSlow applies to item usage:

Eating food
Drinking potions
Using bows
Blocking with shields
Any item with use action

Default: true Location: NoSlow.java:43-46, 158-161

Inv Move (Inventory Movement)

Allows full movement while in inventory screens:

Continues walking with WASD
Can jump with spacebar
Can sprint
Arrow keys control camera rotation:
- Up Arrow: Pitch up (5° per tick)
- Down Arrow: Pitch down (5° per tick)
- Left Arrow: Yaw left (5° per tick)
- Right Arrow: Yaw right (5° per tick)
Pitch clamped to ±90°

Supported Screens:

Player inventory
Chests and containers
Any HandledScreen
ClickGui (client GUI)

Default: true Location: NoSlow.java:47-118, 265-280

Inventory movement is excellent for PvP. You can manage inventory while staying mobile, making you much harder to hit.

Webs

Removes slowdown when moving through cobwebs. Default: true Location: NoSlow.java:51-54

Web NoSlow is easily detectable on most anti-cheat systems. Use with caution.

Crawling

Removes slowdown when in crawling position (1-block gaps). Default: false Location: NoSlow.java:55-58

Sneaking

Removes slowdown while sneaking. Default: false Location: NoSlow.java:59-62

Sneaking NoSlow is very detectable. Most servers expect the sneak slowdown and will flag or kick for removing it.

Mode-Specific Behavior

canNoSlow() Check

Internal method that determines if slowdown removal applies:

boolean canNoSlow() {
    if (!isEnabled()) return false;
    if (!items.getValue()) return false;
    
    // Grim mode: skip offhand items
    if (mode == "Grim" && activeHand == OFF_HAND) return false;
    
    // Meow mode: timing-based
    if (mode == "Meow") {
        return useTimeLeft < 5 || (useTime > 1 && useTime % 2 != 0);
    }
    
    return true;
}

Location: NoSlow.java:156-172

Inventory Interaction Modes

Strict Mode:

Triggers on ClickSlotC2SPacket while moving
Runs bypass before and after packet
Works for all inventory clicks

Meow Mode with Rotate Fix:

Triggers on ClickSlotC2SPacket with sync ID 0
Closes inventory after PICKUP/PICKUP_ALL/QUICK_CRAFT actions
Prevents some detection methods

Location: NoSlow.java:191-194, 240-256

Integration & Compatibility

Freecam Compatibility

Inventory movement disables when Freecam is active:

Prevents camera control conflicts
Returns control when Freecam disabled

Location: NoSlow.java:267-268

Rotation Manager Integration

Grim mode uses RotationManager for accurate packet rotation:

getServerYaw() - Current server-side yaw
getServerPitch() - Current server-side pitch
Ensures rotations match server expectations

Location: NoSlow.java:136

Packet Manager Integration

All packet sending uses PacketManager for proper handling:

sendPacket() - Normal packet sending
sendQuietPacket() - Silent packet sending (no event trigger)
Ensures compatibility with other modules

Location: NoSlow.java:136, 151, 190, 204-207, 212-213, 222, 225, 254

Disabler Integration

The cancelDisabler flag allows Disabler module to temporarily pause NoSlow:

Checked before all packet operations
Prevents conflicts with disabler sequences

Location: NoSlow.java:31, 180, 234

Configuration Examples

Competitive PvP

Mode: Strict
Items: true
Inv Move: true
Webs: false
Crawling: false
Sneaking: false

Balanced setup for PvP with inventory management.

GrimAC Server

Mode: Grim
Items: true
Inv Move: true
Webs: false
Crawling: false
Sneaking: false

Optimized for servers running GrimAC.

Maximum Mobility (Risky)

Mode: Vanilla
Items: true
Inv Move: true
Webs: true
Crawling: true
Sneaking: true

All slowdown removal, very detectable.

Safe Inventory Only

Mode: Strict
Items: false
Inv Move: true
Webs: false
Crawling: false
Sneaking: false

Only enables inventory movement, safest option.

Advanced Usage

Packet Queue System

NoSlow includes a packet queue (currently unused in visible code):

private final Queue<Packet<?>> packets = new LinkedBlockingQueue<>();

The release() method sends all queued packets:

Useful for delayed packet sending
Maintains packet order
Could be used for advanced bypass techniques

Location: NoSlow.java:73, 147-154

Camera Control in Inventory

When in inventory with Inv Move enabled:

Arrow keys directly modify player pitch/yaw
Changes are applied every tick
Pitch is clamped to prevent over-rotation
Works in all supported inventory screens

Keybinds:

Key 264 (Down Arrow): +5 pitch
Key 265 (Up Arrow): -5 pitch
Key 262 (Right Arrow): +5 yaw
Key 263 (Left Arrow): -5 yaw

Location: NoSlow.java:92-115

Camera control in inventory is subtle but powerful. You can adjust your view while organizing inventory, perfect for quick combat preparation.

Usage Tips

Start with Strict mode as it provides good compatibility across various anti-cheat systems.

Inventory movement is the safest NoSlow feature - it rarely triggers anti-cheat since it’s just keyboard input, not packet manipulation.

Grim mode only works for main hand items. If you need to use offhand items without slowdown, use a different mode.

Web NoSlow, Crawling NoSlow, and Sneaking NoSlow are all highly detectable. Enable only when necessary and be prepared for flags.

Technical Details

Strict Mode Bypass Mechanics

Position Packet Technique:

Checks if on ground
Checks if jump key is not pressed
Checks if no block collision at +0.0656 Y
Sends position packet with +0.0656 Y offset and onGround=false
Server interprets as valid movement
Bypasses inventory slowdown check

Why 0.0656? This specific value is small enough to not trigger position checks but large enough to register as actual movement to the server. Location: NoSlow.java:201-216

Event Priority

Inventory movement uses @SubscribeEvent(Priority.MODULE_LAST):

Executes after most other modules
Ensures other modules can process movement first
Prevents conflicts with rotation/movement modules

Location: NoSlow.java:76

Screen Type Detection

boolean canInvMove() {
    if (Freecam.isEnabled()) return false;
    
    return screen instanceof AbstractInventoryScreen
        || screen instanceof HandledScreen
        || screen instanceof ClickGui;
}

Covers all inventory-type screens while excluding incompatible screens. Location: NoSlow.java:265-280

Troubleshooting

Item slowdown still occurring

Verify Items toggle is enabled
Check if using offhand item in Grim mode
Try different mode (Strict is most compatible)
Check if another module is conflicting

Inventory movement not working

Verify Inv Move is enabled
Check if Freecam is active (disables Inv Move)
Ensure you’re in a supported inventory screen
Try toggling the module off and on

Getting kicked when using inventory

Switch to Strict mode
Ensure you’re on ground when clicking
Reduce movement while in inventory
Try disabling Items toggle (use Inv Move only)

Camera rotation not working in inventory

Make sure you’re using arrow keys, not mouse
Verify Inv Move is enabled
Check that screen is a supported inventory type
Try pressing keys firmly (needs active key press per tick)

Grim mode not working

Verify item is in main hand (not offhand)
Check that you’re not sneaking
Ensure not riding entity or flying
Try switching to Strict mode for comparison

Meow mode inconsistent

This is expected - it only allows movement during specific timing windows
Enable Rotate Fix if having inventory issues
Consider switching to Strict for more consistent behavior

Combat

Movement

Render

Misc

Player

​Overview

​NoSlow Modes

​Vanilla

​Grim

​Meow

​Strict

​Feature Toggles

​Items

​Inv Move (Inventory Movement)

​Webs

​Crawling

​Sneaking

​Mode-Specific Behavior

​canNoSlow() Check

​Inventory Interaction Modes

​Integration & Compatibility

​Freecam Compatibility

​Rotation Manager Integration

​Packet Manager Integration

​Disabler Integration

​Configuration Examples

​Competitive PvP

​GrimAC Server

​Maximum Mobility (Risky)

​Safe Inventory Only

​Advanced Usage

​Packet Queue System

​Camera Control in Inventory

​Usage Tips

​Technical Details

​Strict Mode Bypass Mechanics

​Event Priority

​Screen Type Detection

​Troubleshooting

Build docs developers (and LLMs) love

Overview

NoSlow Modes

Vanilla

Grim

Meow

Strict

Feature Toggles

Items

Inv Move (Inventory Movement)

Webs

Crawling

Sneaking

Mode-Specific Behavior

canNoSlow() Check

Inventory Interaction Modes

Integration & Compatibility

Freecam Compatibility

Rotation Manager Integration

Packet Manager Integration

Disabler Integration

Configuration Examples

Competitive PvP

GrimAC Server

Maximum Mobility (Risky)

Safe Inventory Only

Advanced Usage

Packet Queue System

Camera Control in Inventory

Usage Tips

Technical Details

Strict Mode Bypass Mechanics

Event Priority

Screen Type Detection

Troubleshooting