As in previous years, many Japanese web developers participated in ISUCON (an event for improving HTTP server speed) again this year. And many developers chose to play Go again this year.
# Preliminary stage (language, teams, ratio)
Go 402 70.8%
Ruby 43 7.6%
Nodejs 43 7.6%
Python 34 6.0%
Rust 19 3.3%
PHP 16 2.8%
Perl 5 0.9%
Java 5 0.9%
etc(Go2) 1 0.2%
# Final stage
Go 26 86.7%
Nodejs 1 3.3%
Ruby 1 3.3%
Rust 1 3.3%
Perl 1 3.3%
For reference, the programming languages chosen by the winners in the past are as follows