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ViaVersion

ViaVersion

Mod and plugin

Allow newer Java Edition clients to connect to older servers.

Client or server Utility

2.26M downloads
1,126 followers
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d05985f Add effect blending to nausea in 1.21.4->1.21.5 (#4964)

2bb90d3 Preserve legacy stained glass pane falling dust appearance in 1.12->1.13 (#4955)

Map stained glass pane falling dust particles to the corresponding stained glass block state when translating from 1.12.2 to 1.13.

Legacy clients render stained glass and stained glass pane falling dust identically. Modern clients render stained glass pane falling dust with an incorrect dark tint. Preserve the legacy appearance while leaving other block-backed particles unchanged.

e59c12c Add the_end clock (#4961)

b4d8fe6 Display infinite potion effect duration for 1.19.4+, if it would display infinite on 1.19.2 and below (#4953)

cab919b Fix legacy skull rotation overflow in 1.12.2->1.13 (#4952)

9d9fe03 Add rewrite for commands.locatebiome.success (#4949)

8fd09c8 Fix registry key tracking for adding missing keys (#4946)

4802926 Add missing locate command translation to 1.16->1.17 (#4947)

5628bcb Fix ponder_goat_horn key

33062af Fix blocks attacks bypassed_by hashing (#4942)

f32dca9 Make OptionalType non-abstract (#4939)

This allows it to be used like ArrayType without having to create new classes

a09fa97 Send new entries for fully missing registries

0810001 Track gamemode in 1.20.5+ already

9a8a01b Make config limits configurable via system properties

5.9.1

by kennytv on May 4, 2026
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This update mainly brings solid performance improvements for the most time intensive tasks ViaVersion has to handle!

  • Fixed a regression with tag handling for adventure mode predicates in 1.20.3->1.20.5
  • Performance improvements
    • Improve performance of chunk reading, handling, and writing performance
    • Hashing of item stacks is now only done once per pipeline instead of once per protocol transition
    • Improve caching of data held by specific chunks (by Pablete1234)
    • Minor improvements to NBT tag reading and writing

If you want to get larger version updates early, consider supporting me via https://viaversion.com/donate. See the previous update notes for more info.

3e8682f Limit config phase packet queue

1e2c5db Run full item hashing only once per pipeline By only hashing the original item in the first clientbound item rewriter, repeated expensive item hashing (mostly thanks to big text components) in every protocol can be avoided. It is eventually cached in the last clientbound/first serverbound protocol, to be restored immediately and then passed along to the end unchanged.

a11d7eb Improve nbt I/O stream performance A disgusting lot of micro optimization, but stuff that ends up being worth the troubles given how much data nbt tags make up with registry data, block entities and text components.

This generally reduces allocations and work done in reading due to how often the tag keys and values will be ASCII-only characters.

Writing fully drops the additional array allocation as well as extra iterations for length counting

40554ef Add default implementation for DataPalette#replaceId (#4931)

6ce2113 Make AbstractProtocol#registerFinishConfiguration obsolete (#4853)

External resources


Project members

kennytv

Maintainer

creeper123123321

Developer

florianreuth

Maintainer


Technical information

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