Summary of "6x faster? 🏎 Nextcloud Hub 26 Winter: Performance updates with the biggest architecture upgrade yet"

Summary — Nextcloud Hub 26 “ADA” performance update

ADA = Accelerated Direct Access A major rewrite of the database and file-access architecture designed to make Nextcloud scale better and respond faster in highly integrated deployments.

Reorganized database access and identifiers
- Tables and identifiers were split/restructured to allow more direct access patterns.
- Introduces globally-unique / snowflake-style IDs and creates a foundation for advanced sharding (for example, distributing DB nodes across data centers).
Authoritative mount table (replaces mount cache)
- The previous mount cache (who has access to what) is replaced by a single authoritative table that is updated when shares change.
- This shifts work from frequent read-time checks during navigation to less-frequent write-time updates, enabling “lean data access” (only fetch the exact metadata needed).
Direct S3 file/preview downloads
- On S3-backed storage, clients can download files and previews directly from S3, bypassing the application server to save network/hardware overhead and reduce latency.

New “high performance” backends:
- Files backend written in Rust.
- Talk backend written in Go.
These backends now push state/notifications (file changes, chat events, user presence) directly to clients rather than only notifying. This reduces server load substantially — up to about an 80% reduction in some scenarios.

Assistant / local AI tasks (text/image generation, speech↔text, contextual chat): up to 10× faster.
Local translation: ~8× faster.
Mobile background jobs: sped up.
Previews and photos: ~40–60% faster.
Talk (fetching/sharing data): ~20% faster.
UI JavaScript: reduced by ~10% through removal of legacy libraries.

MagentaCLOUD (Deutsche Telekom) collaboration:
- Database read/write split reduced load on the heaviest DB node by ~20–30%.
- End-to-end example: a 10 MB file download dropped from ~2.5 s to ~0.4 s (≈6× faster) on their system.
Many improvements come from community and partner contributions (including Deutsche Telekom). Some client-side UI changes (iOS/Android photo view) will appear in upcoming app updates.

ADA provides a base to push more operations to direct DB/file access and to implement more advanced sharding and scaling capabilities over time.

The presentation repeatedly refers to a detailed Nextcloud blog post describing the ADA engine technical details — recommended for in-depth architecture and implementation notes.
Expect forthcoming app updates (iOS/Android) and continued community-contributed improvements.