# Scalability Ceilings: Optimization Strategies Above 100M Ratings

> Source: https://sukruyusufkaya.com/en/learn/oneri-sistemleri/scalability-tavanlari-100m-rating-optimizasyon
> Updated: 2026-05-13T13:29:35.312Z
> Category: Öneri Sistemleri
> Module: Module 5: Memory-Based Collaborative Filtering (k-NN)
**TLDR:** MovieLens-1M is too small — in real world you work with 100M+ ratings, 10M+ items. This lesson: offline batch precomputation pattern, LSH (Locality-Sensitive Hashing), MinHash for approximate Jaccard, distributed computation with MapReduce/Spark, Redis-based serving.