Task Manager

Task Manager is a Fabric client profiler for modded Minecraft that helps you identify frame drops, high MSPT, hot mods, rendering spikes, block-entity pressure, and JVM/runtime issues while the game is still running.

Open the profiler in-game with F12.

Showcase: https://youtu.be/YeJJnLdL9i0

Key Features

Live per-mod CPU attribution with sampled stack ownership and event invokes shown separately
Estimated per-mod GPU attribution using render-thread sampling plus measured GPU timer-query time
Per-mod memory estimates, shared JVM/runtime buckets, and top live class families
Loader-aware startup timing measured from Fabric entrypoint execution and shown explicitly in ms
Timeline graphs for frametime, FPS, network throughput, and disk throughput
World diagnostics with Lag Map and Block Entities mini-tabs
JVM thread diagnostics, waits/locks, and sensor/runtime health in the System tab
Session recording and export with summarized worst frame, MSPT spikes, top CPU/GPU/memory mods, hot chunk, and block-entity hotspots
Optional HUD overlay with configurable sections, layout, position, and trigger mode

Task Manager

Tabs

Tasks: per-mod CPU share, sampled threads, sample counts, invokes, filtering, sorting, and row detail
GPU: estimated per-mod GPU share, render samples, thread counts, filtering, sorting, and row detail
Render: render-phase CPU/GPU timings and call counts
Startup: Fabric startup/entrypoint timing by mod in explicit milliseconds
Memory: per-mod heap estimates, shared JVM buckets, top classes, filtering, sorting, and shared-family drilldown
Flame: sampled stack/flame-style hotspot view
Timeline: frametime, FPS, jitter, variance, frame percentiles, GPU frame time, and MSPT overview
Network: inbound/outbound throughput graphs plus packet/category breakdowns
Disk: disk read/write throughput graphs
World: lag map, hot chunks, entity hotspots, and block-entity drilldown
System: CPU/GPU load, temperatures, thread load, waits/locks, sensors, and runtime diagnostics
Settings: session options, HUD options, and configurable table column visibility

Task Manager

Controls

F12: open Task Manager
F11: start/stop session recording
F10: toggle HUD overlay

All keybinds can also be changed in Minecraft controls.

Searching, Sorting, and Columns

Tasks, GPU, and Memory support:

typed search/filter boxes
clickable sortable columns
configurable column visibility from the Settings tab

Sessions and Export

Session exports include a polished summary with:

worst frame
worst MSPT spike
top CPU mods
top GPU mods
top memory mods
hot chunk summary
block entity classes
rule findings and sensor diagnostics

Notes on Accuracy

Task Manager aims to be honest about what is measured versus estimated:

CPU attribution is based on sampled stack ownership
GPU attribution is estimated from render-thread samples weighted by GPU timer-query time
Memory attribution is based on JVM/class-histogram style ownership and shared runtime buckets
Temperatures and some system metrics depend on what the platform or an external sensor provider exposes

That means the profiler is very useful for finding hotspots and spikes, but some values, especially GPU-per-mod and shared JVM memory, should be interpreted as guidance rather than perfect ground truth.

TaskManager