Servers are expensive. To save money, let’s use our clients’ CPUs as much as possible. The additional cost to a client is negligible (e.g., an extra 50msec), however when you multiply that by 100,000 requests (approx. 1.4 hours of server time per day), it adds up.

I wonder which tasks could be outsourced to the client?

• rendering templates (via client MVC and JSON API)
• conversions (absolute time to relative time, time zones)
• validations

Link: [Rails Best Practices

Not use time_ago_in_words]1