From 85108f3519d3226a44794ebb09f5993700046a87 Mon Sep 17 00:00:00 2001
From: gilice <104317939+gilice@users.noreply.github.com>
Date: Thu, 6 Feb 2025 18:53:30 +0100
Subject: [PATCH] muxml: switch to FxHash

... for about 5% performance improvement
---
 Cargo.lock               | 7 +++++++
 Cargo.toml               | 1 +
 src/backend/muxml/mod.rs | 6 ++++--
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index c68e2c0..10456b5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -257,6 +257,12 @@ dependencies = [
  "crossbeam-utils",
 ]
 
+[[package]]
+name = "rustc-hash"
+version = "2.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "357703d41365b4b27c590e3ed91eabb1b663f07c4c084095e60cbed4362dff0d"
+
 [[package]]
 name = "scoreman"
 version = "1.0.0"
@@ -267,6 +273,7 @@ dependencies = [
  "itertools",
  "itoa",
  "midly",
+ "rustc-hash",
  "yansi",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index 7c3101b..0a313b0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,6 +14,7 @@ clap = { version = "4.5.4", features = ["derive"] }
 itertools = "0.14.0"
 itoa = "1.0.11"
 midly = "0.5.3"
+rustc-hash = "2.1.1"
 yansi = "1.0.1"
 
 [dev-dependencies]
diff --git a/src/backend/muxml/mod.rs b/src/backend/muxml/mod.rs
index caa04cb..34bf24d 100644
--- a/src/backend/muxml/mod.rs
+++ b/src/backend/muxml/mod.rs
@@ -16,6 +16,7 @@ use formatters::{
     MUXML_INCOMPLETE_DOC_PRELUDE,
 };
 use fretboard::get_fretboard_note2;
+use rustc_hash::FxBuildHasher;
 use std::collections::HashMap;
 use std::time::Duration;
 
@@ -54,7 +55,8 @@ pub enum Muxml2TabElement {
 
 impl Muxml2TabElement {
     fn write_muxml<A: std::fmt::Write>(
-        &self, parsed: &ParseResult, buf: &mut A, note_properties: &HashMap<u32, NoteProperties>,
+        &self, parsed: &ParseResult, buf: &mut A,
+        note_properties: &HashMap<u32, NoteProperties, impl std::hash::BuildHasher>,
     ) -> std::fmt::Result {
         match self {
             Muxml2TabElement::Rest(mut x) => {
@@ -192,7 +194,7 @@ fn gen_muxml2(
     debugln!("muxml2: reserved {}", cap);
     let mut slur_cnt = 0;
     let mut slide_count = 0;
-    let mut note_properties: HashMap<u32, NoteProperties> = HashMap::new();
+    let mut note_properties: HashMap<u32, NoteProperties, FxBuildHasher> = HashMap::default();
     for measure_idx in 0..number_of_measures {
         traceln!("Muxml2: processing measure {}", measure_idx);
         let ticks_in_measure = rlen(&parsed.measures[measure_idx].data_range) / 6; // see assumption 2