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ViaVersion

ViaVersion

Mod and plugin

Allow newer Java Edition clients to connect to older servers.

Client or server Utility

2.01M downloads
1,070 followers
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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)

315a987 Fix edge case in DataPaletteImpl#replaceIds (#4930)

333a373 Add default implementation for DataPalette#replaceIds (#4927)

8c57534 Improve chunk rewriting performance

686e690 Improve performance of palette I/O

e15fc59 Trim slightly more fastutil, use its interfaces for the long collections

c611a34 Migrate chunk-key maps to fast util (#4923)

b3d560b Track tags for adventure mode preciates again in 1.20.3->1.20.5

5.9.0

by kennytv on Apr 19, 2026
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This update includes some larger changes to how rewriters are registered internally, so custom platform implementations with additional protocol registrations may break. See SharedRegistrations.

  • Fixed water physics sometimes breaking in 1.21.11->26.1
  • Fixed kick when opening game rules edit screen in 1.21.11->26.1 (by EnZaXD)
  • Fixed baby wolf textures in 1.21.11->26.1
  • Fixed jukebox_playable song handling in 1.21.11->26.1
  • Fixed time command messages in 1.21.11->26.1 (by EnZaXD)
  • Fixed sneaking tracking during interactions 1.21.11->26.1 (by EnZaXD)
  • Fixed swing animation when placing plants and some container-specific interactions in 1.21.11->26.1 (by EnZaXD)
  • Handle nested enchantment terms (by DrexHD)
  • Handle nested dialogs and dialog click events (by EnZaXD)
  • Fixed hashing of attribute_modifiers with override text
  • Fixed transient map_post_processing data component causing error in 1.20.5->1.20.3
  • Fixed adventure mode predicate error in 1.20.4->1.20.5

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.

4c55ef9 Remove rewriter overrides in AbstractProtocol (#4913)

a66dbf7 Fix profile with multiple properties of the same key in 1.20.5->1.20.3 (#4909)

c6cc380 Fix fluid block counting Fixes #4912

cd3f146 Fix block state translation in falling block (#4910)

Fixes #4908

External resources


Project members

kennytv

Maintainer

creeper123123321

Developer

florianreuth

Maintainer


Technical information

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