use hashbrown

Cargo.toml

@@ -12,7 +12,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [features]
-default = ["auxcleanup_gas_deletion", "turf_processing", "katmos"]
+default = ["auxcleanup_gas_deletion", "turf_processing"]
 auxcleanup_gas_deletion = ["auxcleanup"]
 zas_hooks = []
 turf_processing = []
@@ -44,6 +44,7 @@ ahash = "0.8.3"
 lazy_static = "1.4.0"
 indexmap = { version = "2.0.0", features = ["rayon"] }
 dashmap = { version = "5.5.0", features = ["rayon"] }
+hashbrown = "0.14.0"
 atomic_float = "0.1.0"
 petgraph = "0.6.3"
 bitflags = "2.3.3"

src/gas/types.rs

@@ -13,10 +13,12 @@ use dashmap::DashMap;
 
 use std::{
 	cell::RefCell,
-	collections::{BTreeMap, HashMap},
+	collections::BTreeMap,
 	sync::atomic::{AtomicUsize, Ordering},
 };
 
+use hashbrown::HashMap;
+
 static TOTAL_NUM_GASES: AtomicUsize = AtomicUsize::new(0);
 
 static REACTION_INFO: RwLock<Option<BTreeMap<ReactionPriority, Reaction>>> = const_rwlock(None);

src/reaction.rs

@@ -25,7 +25,7 @@ pub struct Reaction {
 }
 
 use fxhash::FxBuildHasher;
-use std::collections::HashMap;
+use hashbrown::HashMap;
 
 enum ReactionSide {
 	ByondSide(Value),

src/reaction/hooks.rs

@@ -338,7 +338,7 @@ fn fusion(byond_air: &Value, holder: &Value) -> DMResult<Value> {
 #[cfg(feature = "generic_fire_hook")]
 fn generic_fire(byond_air: &Value, holder: &Value) -> DMResult<Value> {
 	use fxhash::FxBuildHasher;
-	use std::collections::HashMap;
+	use hashbrown::HashMap;
 	let mut burn_results: HashMap<GasIDX, f32, FxBuildHasher> = HashMap::with_capacity_and_hasher(
 		super::total_num_gases() as usize,
 		FxBuildHasher::default(),

src/turfs/katmos.rs

@@ -15,11 +15,13 @@ use coarsetime::{Duration, Instant};
 use std::{
 	cell::Cell,
 	{
-		collections::{BTreeSet, HashMap, HashSet},
+		collections::BTreeSet,
 		sync::atomic::{AtomicUsize, Ordering},
 	},
 };
 
+use hashbrown::{HashMap, HashSet};
+
 use parking_lot::{const_mutex, Mutex};
 
 static EQUALIZE_CHANNEL: Mutex<Option<BTreeSet<TurfID>>> = const_mutex(None);