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System tests allow you to u...
Setup your development environment.
Configure your production server.
Learn how to modify production to run websockets.
Use memoization to your advantage to cache results in memory to improve speed
Learn how I design GoRails for speed and performance on all layers of the stack
Learn how to improve the speed of your database queries by adding database indexes to your tables
Learn how Bootsnap speeds up your Ruby and Rails app boot times by preloading the load paths and caching Ruby bytecode
A CDN can distribute assets globally and allow more parallel downloads. This equates to performance benefits for users anywhere in the world