Benchmarks

bench/render.rb renders the same five-level trail (Home > Customers > Alice > Orders > Order 2026-0042) with gretel and with GretelX, and checks that both produce the same output. The <ol> is gretel’s breadcrumbs(style: :ol) against a ten-line helper over breadcrumb_trail. The JSON-LD is gretel’s structured_data(url_base:) (paths behind a prefix) against breadcrumb_json_ld (_url helpers), both encoded and escaped the same way.

Ruby 4.0.9, Rails 8.1.4, gretel 5.1.0, Apple M5 (arm64 macOS), median of three runs of benchmark-ips

Render	Allocations	Time, YJIT off	Time, YJIT on
gretel <ol>	345	57.6 µs	35.1 µs
GretelX <ol>	274	45.4 µs	29.8 µs
gretel JSON-LD	268	41.3 µs	25.4 µs
GretelX JSON-LD	287	43.3 µs	29.5 µs

Most of the JSON-LD gap comes from Rails’ _url helpers, which are slower than _path ones: building the BreadcrumbList from the levels accounts for 1.7 µs of it.

From a checkout of the gem, once with YJIT off and once with it on:

bundle exec ruby bench/render.rb
bundle exec ruby --yjit bench/render.rb

Run each three times and keep the median. Numbers depend on the machine: compare the two gems on the same one, not against this table.