Older Rails versions used to use the Quiet Assets GEM which was then rolled directly into the Rails asset pipeline with
# config/environments/development.rb config.assets.quiet = true
This switch works with Webrick and the development.log file, but I usually code with Webrick and byebug for debugging, so I have the console open and am always reading the STDOUT stream. The Asset logging stream is NOT silenced from the STDOUT so my console is still hopelessly cluttered.
Ruby monkey-patching to the rescue:
if Rails.env.development? && defined?(::WEBrick) # Stop all the /assets/ logs in the webrick stdout module WEBrick...