fastfastmap

FastFastMap

A high-performance minimap mod for Minecraft 1.21.11 (Fabric).
Built for speed — parallel chunk scanning, GPU tile caching, and seamless updates with zero flicker.

Features

HUD Minimap

Always-on minimap in the bottom-right corner of your screen.

• Player direction arrow — red filled triangle with white outline, rotates with your view
• Water bathymetry — see the terrain beneath the water, depth-shaded in blue
• Smooth height shading — continuous brightness based on slope, not discrete steps
• Biome tint — grass, leaves, and water colored per biome

Fullscreen Map M

Google Maps-style tile viewer. Open with M, close with M or Esc.

• Zoom to cursor — scroll wheel zooms centered on your mouse position
• Smooth zoom animation — no jarring snaps
• LOD tile system — automatically switches tile resolution as you zoom in/out

(zoom 5 = 16px/block → zoom −3 = 16 blocks/px)

• Fallback rendering — lower-res tiles shown while high-res tiles load; no black squares
• Right-click drag to pan, R to re-center on player

Persistent Cache

Your map data is saved to disk and restored on reconnect — no need to re-explore.

• Separate cache per server address and world name
• Auto-saves every 60 seconds and on disconnect
• Previously explored areas appear on the map instantly when you rejoin

Performance

• Chunk scanning runs on parallel worker threads (up to 4)
• GPU tile cache with LRU eviction (128 tiles max)
• Anti-flicker design — chunk updates never cause blank tiles; old tiles stay visible until the new render is ready, then swap seamlessly.
• RAM tile cache capped at 512 tiles (~128 MB)

Controls

| Key / Input | Action |
|—|—|
| M | Open / close fullscreen map |
| Scroll wheel | Zoom in / out (cursor-centered) |
| Right-click drag | Pan the map |
| R | Re-center on player |

Compatibility

Works alongside all major optimization mods.

Recommended Mods

| Mod Name | Modrinth Link |
|—————|—————|
| Bobby | Bobby |
| Sodium | Sodium |
| C2ME | C2ME Fabric
C2ME NeoForge |
| Lithium | Lithium |
| ScalableLux | ScalableLux |
| Mod Menu | Mod Menu |

Requirements

Multi-core CPU
RTX 3000 series or higher