ParityFast is a lightweight Fabric optimization mod for Minecraft 1.14.4.
It optimizes selected vanilla helper paths used by math, random, lookup, and position-related code. The mod is designed to preserve vanilla-compatible behavior while reducing overhead in specific hot paths.
ParityFast does not claim to improve every server, every world, or every workload. Performance impact depends on the world, entity count, tick load, installed mods, JVM, and hardware.
Optimized Areas
ParityFast currently targets:
MathHelpersine/cosine lookup behavior verified against vanilla table values- Selected exact helper methods such as floor, ceil, sqrt, abs, clamp, lerp, wrapping, angle, color, hash, and binary-search helpers
- Selected
BlockPosencode/decode and offset helper paths - Selected direction lookup helpers
- Random handling paths designed to preserve vanilla sequence behavior where applicable
- Cached enum/list/hash lookups used by entity ticking, chunk tickets, and block-neighbor checks
Benchmarks
These benchmarks show one synthetic stress scenario, not a general performance guarantee.
Tested on a superflat world with a high entity count (roughly 200), active random ticking, and /gamerule randomTickSpeed 5000. Tested using Carpet /tick health.
| Metric | Vanilla | ParityFast | Difference |
|---|---|---|---|
| Avg MSPT | 48.46ms | 39.97ms | -17.5% |
| Block Tick Time | 20.90ms | 12.97ms | -37.9% |
| Entity Tick Time | 15.55ms | 15.83ms | roughly unchanged |
Results may vary depending on workload, hardware, JVM settings, and other installed mods.
Test Environment
- Minecraft 1.14.4
- Fabric
- Ryzen 9 9950X3D
Vanilla Parity
ParityFast keeps Java Random's vanilla 48-bit LCG algorithm instead of switching to Java 17 LXM or SplitMix. When possible, it copies the existing random seed and continues from the same state.
