Run with:
cargo run --release
The behaviour I'm seeing on my M1 macbook pro:
Finished release [optimized] target(s) in 0.26s
Running `target/release/am-repro`
Loading C1_fast.am into automerge (82920 bytes)
Automerge took 134 ms to load
Getting text content...
Text document 21362 bytes long
Loading C1_slow.am into automerge (1524538 bytes)
Automerge took 158872 ms to load
Getting text content...
Text document 534050 bytes long