AstonJ
Rails console using 100% CPU in dev (fix)
If you are experiencing Rails console using 100% CPU on your dev machine, then updating your development and test gems might fix the issue - at least that’s what worked for me. Here’s my old and new (old versions are commented out):
# group :development do
# # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
# gem 'web-console', '>= 3.3.0'
# gem 'listen', '>= 3.0.5', '< 3.2'
# # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
# gem 'spring'
# gem 'spring-watcher-listen', '~> 2.0.0'
# end
group :development do
# Access an interactive console on exception pages or by calling 'console' anywhere in the code.
gem 'web-console', '>= 4.1.0'
# Display performance information such as SQL time and flame graphs for each request in your browser.
# Can be configured to work on production as well see: https://github.com/MiniProfiler/rack-mini-profiler/blob/master/README.md
gem 'rack-mini-profiler', '~> 2.0'
gem 'listen', '~> 3.3'
# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring'
end
# group :test do
# # Adds support for Capybara system testing and selenium driver
# gem 'capybara', '>= 2.15'
# gem 'selenium-webdriver'
# # Easy installation and use of web drivers to run system tests with browsers
# gem 'webdrivers'
# end
group :test do
# Adds support for Capybara system testing and selenium driver
gem 'capybara', '>= 3.26'
gem 'selenium-webdriver'
# Easy installation and use of web drivers to run system tests with browsers
gem 'webdrivers'
end
Hope this saves someone a few hours of faffing around trying to troubleshoot the issue! 
Most Liked
ohm
It was probably listen. listen 3.3.0 fixed a lot of threading and process problems.
1
ohm
I’ve had some trouble with spring just sitting there as well. spring is used to preload the app, so you can tear down and start up a server or console snappy.
1
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