Redmine

On Ruby 4.0.1, rendering wiki via Redmine::WikiFormatting.to_html is significantly slower than on Ruby 3.4.

The benchmarks below suggest:

• wiki rendering is consistently slower on Ruby 4.0.1
• the impact is larger for CommonMark
• the slowdown is more pronounced when the input includes a table and a code block
• performance regresses further after the #43643 related commits

CommonMark¶

bench_commonmark.rb

After #43643¶

Ruby 4.0.1:

full_ms=1351.52 avg_full=67.58

Ruby 3.4.7:

full_ms=139.79 avg_full=6.99

Before #43643¶

Ruby 4.0.1

full_ms=802.53 avg_full=40.13

Ruby 3.4.7

full_ms=176.22 avg_full=8.81

Textile¶

bench_textile.rb

After #43643¶

Ruby 4.0.1:

full_ms=218.49 avg_full=10.92

Ruby 3.4.7:

full_ms=100.94 avg_full=5.05

Before #43643¶

Ruby 4.0.1

full_ms=13.97 avg_full=0.7

Ruby 3.4.7

full_ms=32.01 avg_full=1.6

Environment¶

• Ruby 4.0.1 vs Ruby 3.4.7 (same Gemfile.lock)
• commonmarker 2.6.3
• loofah 2.25.0
• rouge 4.7.0