# Performance Impact > Depth-first rabbithole dossier for Performance Impact; source-anchored research pack. Parent: [MongoDB Transactions](https://llms-explorer.com/tree/mongodb-transactions/) · 1 facets · 4 facts · page: https://llms-explorer.com/tree/performance-impact/ ## Facts and statements - [low] Transactions targeting a single shard have the same performance as replica-set transactions, while those affecting multiple shards incur a greater performance cost. Sources: https://www.mongodb.com/docs/manual/core/transactions-sharded-clusters.md — source: `~/.global-ai-hub/research/.pipeline/mongodb-2026-10-14/frb/performance-impact-5e1268b546/rabbithole-synthesis.md#core` - [low] If an ongoing transaction holds a lock on a collection and a chunk migration involving that collection starts, the migration stages must wait for the transaction to release the locks, impacting chunk migration performance. Sources: https://www.mongodb.com/docs/manual/core/transactions-sharded-clusters.md — source: `~/.global-ai-hub/research/.pipeline/mongodb-2026-10-14/frb/performance-impact-5e1268b546/rabbithole-synthesis.md#core` - [low] Using multi-document transactions can improve write performance by reducing commit latency; for example, with w:majority write concern, 10 independent updates each wait for a replication round trip, whereas the same 10 updates in a transaction are replicated together at commit time, reducing latency by 10 times. Sources: https://www.mongodb.com/blog/post/performance-best-practices-transactions-and-read--write-concerns — source: `~/.global-ai-hub/research/.pipeline/mongodb-2026-10-14/frb/performance-impact-5e1268b546/rabbithole-synthesis.md#core` - [low] In most cases, a distributed transaction incurs a greater performance cost over single document writes, and the availability of distributed transactions should not replace effective schema design. Sources: https://www.mongodb.com/docs/manual/data-modeling/best-practices.md — source: `~/.global-ai-hub/research/.pipeline/mongodb-2026-10-14/frb/performance-impact-5e1268b546/rabbithole-synthesis.md#antipatterns` ## Related concepts - Performance — is a part of Performance Impact