Performance

This guide will cover all sorts of topics related to Spree application performance

Application
API
OJ gem
We strongly recommend adding OJ gem to your application. 
If you're using Spree Starter this gem is already pre-installed and pre-configured. If you're not using Spree Starter you can easily add it yourself - please see this git commit.
Caching configuration
There are several configuration options you can put in config/initializers/spree.rb to adjust API caching configuration:
Spree::Api::Config[:api_v2_cache_ttl] = 3600 # TTL for cached resources in seconds
This is the time when API objects will be available in cache storage. Objects such as Products also auto-expire when they are updated or one of their associated resources (eg. Variants) are updated also. 
Background jobs
Sending emails, parsing big amounts of data - it's not recommended to do it in the web process. 
We recommend setting up Sidekiq with ActiveJob, this required a Redis instance. Spree Starter users don't need to do anything as it's already pre-configured for them.
Testing locally
To enable caching in the development environment please type in your project directory:
bin/rails dev cache
or if you're using Spree Starter
docker-compose run web rails dev:cache
After that, you will need to restart your webserver / or stop/start docker-compose.
Infrastructure
Cache storage engine
We strongly recommend using Memcached or Redis as cache storage. 
Spree Starter
Starter is pre-configured to work with Memcached. To enable caching please set the ENV variables:
MEMCACHEDCLOUD_SERVERS - URL of the Memcached instance
MEMCACHEDCLOUD_USERNAME / MEMCACHEDCLOUD_PASSWORD - username/password required to access instance
MEMCACHED_POOL_SIZE - connection pool, defaults to 5 
Memcached
Please see the configuration options detailed in Rails Guides.
Redis
Please see the configuration options detailed in Rails Guides.
​