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Caching improves performance by storing the results of expensive database queries and template renders in memory.

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Setting up Redis as Cache Store

Spree comes pre-configured to use Redis for caching in production. Just set the REDIS_URL environment variable — no gem installation or code changes needed. 
REDIS_URL=redis://localhost:6379/0
When REDIS_URL is set, Spree automatically uses it for caching. When not set, it falls back to an in-memory cache store.

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Testing Locally

To enable caching in the development environment: 
cd server
bin/rails dev:cache
You will need to restart your web server after this.