Pick Block Optimizer
Pick Block Optimizer changes how the client handles the pick block action, so the selected block shows up without waiting on the server round trip.
What it does
Normally the client waits for the server to answer a pick block request before it shows the result. This mod has the client predict the pick block result locally and apply it at once. When the server's authoritative answer arrives, the client corrects its own view to match.
The mod targets high-latency connections, where a server response can add a delay of 100 ms to 500 ms or more. Predicting locally removes that wait for quick actions such as selecting items. It is client-side only, so servers and other players do not need it, and it is published for Fabric and 1.21.8 only, under All rights reserved. The code is not open source, though public source links exist.
Key features
Local pick block prediction
The client applies the pick block result immediately instead of waiting for the server's reply.
Server correction
When the server's result differs from the prediction, the client updates its view to match the accepted world state.
Faster update propagation
Block state packets are processed more promptly on the client, so the authoritative state reaches the screen sooner.
Smaller desync windows
Mismatches where the server records a pick the client has not yet shown are reduced, so players rarely see an empty result.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Playing on a distant server
Players on connections with high round-trip latency can select items without the lag of a server reply.
Who it’s for: Players on Fabric 1.21.8 who notice delay when picking blocks on servers with high network latency.
How it compares
Tnt Minecart Optimizer is a Fabric, client-side only mod under the MIT License, not open source, for 1.21.1 – 1.21.11, so it targets a different area of the game. ImWhy's Shield Optimizer is a Fabric client-side mod under the MIT License for 1.21.11 only. Tab Optimizer is also Fabric and client-side only under the MIT License, but it is open source and covers 1.21.11 only.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Pick Block Optimizer | Fabric | 1.21.8 | Client-side only | 2026-04-09 |
| Tnt Minecart Optimizer | Fabric | 1.21.1 – 1.21.11 | Client-side only | 2026-02-07 |
| ImWhy's Shield Optimizer | Fabric | 1.21.11 | Client-side only | 2026-04-23 |
| Tab Optimizer | Fabric | 1.21.11 | Client-side only | 2026-07-23 |
Questions
Does Pick Block Optimizer need to be installed on the server?
Which loader and game version does Pick Block Optimizer support?
Is the source code of Pick Block Optimizer available?
In the catalog
Pick Block Optimizer 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 alexpeanutsdavidson
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What the author says
Now: - The client immediately predicts and applies the Pickblock result locally. - If the server’s authoritative result differs from what the client predicted, the client updates accordingly when that response arrives. This eliminates the feeling of input lag caused by round‑trip network latency.
Official listing
- Modrinth page
- modrinth.com/mod/pick-block-optimizer
- Owner
- alexpeanutsdavidson
- Published
- 2026-04-09
- Updated on Modrinth
- 2026-04-09
- Facts verified
- 2026-10-15