Projectile Fix
by Smartin-b
Projectile Fix corrects how fast-moving projectiles are sent to clients, so arrows and other entities moving beyond 3.9 blocks per tick render properly.
What it does
Minecraft does not display entities that move faster than 3.9 blocks per tick correctly on the client, and Projectile Fix addresses that by syncing their velocity correctly. The mod changes only the speed of affected projectiles as seen by the client; according to its author, the wrong speed comes from an improper calculation in the vanilla code. Client and server both need the mod, and it is released under the MIT License as open source for 1.21 – 1.21.8.
Key features
Fast projectile display
Projectiles moving faster than 3.9 blocks per tick appear at their correct positions on the client.
Corrected velocity sync
Velocity is synced to the client properly, replacing the miscalculated speed used by vanilla.
Projectile position correction
Arrows and other fast entities are shown where the server actually places them, without visible lag or jumps on the client.
Compatibility
Latest build for each game version and loader.
1.21.x9 of 9 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Swim Fix is server-side only and open source under the GNU Lesser General Public License v3.0 only, covering 1.21 – 1.21.10 on Fabric and NeoForge. MC-56533-FIX is client-side only, is not open source, and targets NeoForge 1.21.1 alone.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Projectile Fix | Fabric and NeoForge | 1.21 – 1.21.8 | Client and server | 2025-09-01 |
| Swim Fix | Fabric and NeoForge | 1.21 – 1.21.10 | Server-side only | 2025-11-20 |
| MC-56533-FIX | NeoForge | 1.21.1 | Client-side only | 2026-02-11 |
Questions
Does Projectile Fix need to be installed on the server?
In the catalog
Projectile Fix is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 17,695 mods support Minecraft 1.21.8.
More from Smartin-b
Similar mods
What the author says
Minecraft has a bug where when an entity exceeds 3.9 blocks/tick it doesnt display correctly on the client. It not only will have the wrong speed, but due to improper math by mojang its direction is also falsified. This mod adresses that and correctly syncs the velocity to the client.
Official listing
- Modrinth page
- modrinth.com/mod/projectile-fix
- Owner
- Smartin-b
- Published
- 2025-09-01
- Updated on Modrinth
- 2025-09-01
- Facts verified
- 2026-10-15