--- a/Cargo.lock
+++ b/Cargo.lock
@@ -172,6 +172,7 @@
  "jrsonnet-stdlib",
  "md5",
  "pathdiff",
+ "rustc-hash",
  "serde",
  "serde_json",
  "structdump",
@@ -322,6 +323,12 @@
 ]
 
 [[package]]
+name = "rustc-hash"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
+
+[[package]]
 name = "ryu"
 version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
--- a/crates/jrsonnet-evaluator/Cargo.toml
+++ b/crates/jrsonnet-evaluator/Cargo.toml
@@ -9,7 +9,7 @@
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [features]
-default = ["serialized-stdlib", "faster", "explaining-traces"]
+default = ["serialized-stdlib", "faster", "explaining-traces", "serde-json"]
 # Serializes standard library AST instead of parsing them every run
 serialized-stdlib = ["serde", "bincode", "jrsonnet-parser/deserialize"]
 # Allow to convert Val into serde_json::Value and backwards
@@ -35,6 +35,7 @@
 
 md5 = "0.7.0"
 base64 = "0.12.3"
+rustc-hash = "1.1.0"
 
 # Serialized stdlib
 [dependencies.serde]
--- a/crates/jrsonnet-evaluator/src/builtin/mod.rs
+++ b/crates/jrsonnet-evaluator/src/builtin/mod.rs
@@ -158,7 +158,7 @@
 		("std", "native") => parse_args!(context, "std.native", args, 1, [
 			0, x: [Val::Str]!!Val::Str, vec![ValType::Str];
 		], {
-			Ok(with_state(|s| s.settings().ext_natives.get(&x).cloned()).map(|v| Val::Func(FuncVal::NativeExt(x.clone(), v))).ok_or_else(
+			Ok(with_state(|s| s.settings().ext_natives.get(&x).cloned()).map(|v| Val::Func(Rc::new(FuncVal::NativeExt(x.clone(), v)))).ok_or_else(
 				|| UndefinedExternalFunction(x),
 			)?)
 		})?,
@@ -212,7 +212,7 @@
 			if arr.len() <= 1 {
 				return Ok(Val::Arr(arr))
 			}
-			Ok(Val::Arr(sort::sort(context, arr, keyF)?))
+			Ok(Val::Arr(sort::sort(context, arr, &keyF)?))
 		})?,
 		// faster
 		("std", "format") => parse_args!(context, "std.format", args, 2, [
--- a/crates/jrsonnet-evaluator/src/ctx.rs
+++ b/crates/jrsonnet-evaluator/src/ctx.rs
@@ -2,6 +2,8 @@
 	error::Error::*, future_wrapper, map::LayeredHashMap, rc_fn_helper, resolved_lazy_val,
 	LazyBinding, LazyVal, ObjValue, Result, Val,
 };
+use rustc_hash::FxHashMap;
+use std::hash::BuildHasherDefault;
 use std::{cell::RefCell, collections::HashMap, fmt::Debug, rc::Rc};
 
 rc_fn_helper!(
@@ -71,14 +73,15 @@
 	}
 
 	pub fn with_var(self, name: Rc<str>, value: Val) -> Context {
-		let mut new_bindings = HashMap::with_capacity(1);
+		let mut new_bindings =
+			FxHashMap::with_capacity_and_hasher(1, BuildHasherDefault::default());
 		new_bindings.insert(name, resolved_lazy_val!(value));
 		self.extend(new_bindings, None, None, None)
 	}
 
 	pub fn extend(
 		self,
-		new_bindings: HashMap<Rc<str>, LazyVal>,
+		new_bindings: FxHashMap<Rc<str>, LazyVal>,
 		new_dollar: Option<ObjValue>,
 		new_this: Option<ObjValue>,
 		new_super_obj: Option<ObjValue>,
@@ -127,7 +130,8 @@
 	) -> Result<Context> {
 		let this = new_this.or_else(|| self.0.this.clone());
 		let super_obj = new_super_obj.or_else(|| self.0.super_obj.clone());
-		let mut new = HashMap::with_capacity(new_bindings.len());
+		let mut new =
+			FxHashMap::with_capacity_and_hasher(new_bindings.len(), BuildHasherDefault::default());
 		for (k, v) in new_bindings.into_iter() {
 			new.insert(k, v.evaluate(this.clone(), super_obj.clone())?);
 		}
--- a/crates/jrsonnet-evaluator/src/evaluate.rs
+++ b/crates/jrsonnet-evaluator/src/evaluate.rs
@@ -9,6 +9,7 @@
 	ForSpecData, IfSpecData, LiteralType, LocExpr, Member, ObjBody, ParamsDesc, UnaryOpType,
 	Visibility,
 };
+use rustc_hash::FxHashMap;
 use std::{collections::HashMap, rc::Rc};
 
 pub fn evaluate_binding(b: &BindSpec, context_creator: ContextCreator) -> (Rc<str>, LazyBinding) {
@@ -45,7 +46,7 @@
 }
 
 pub fn evaluate_method(ctx: Context, name: Rc<str>, params: ParamsDesc, body: LocExpr) -> Val {
-	Val::Func(FuncVal::Normal(Rc::new(FuncDesc {
+	Val::Func(Rc::new(FuncVal::Normal(FuncDesc {
 		name,
 		ctx,
 		params,
@@ -351,7 +352,7 @@
 					let key = evaluate(ctx.clone(), &obj.key)?;
 					let value = LazyBinding::Bindable(Rc::new(
 						closure!(clone ctx, clone obj.value, |this, _super_obj| {
-							Ok(LazyVal::new_resolved(evaluate(ctx.clone().extend(HashMap::new(), None, this, None), &value)?))
+							Ok(LazyVal::new_resolved(evaluate(ctx.clone().extend(FxHashMap::default(), None, this, None), &value)?))
 						}),
 					));
 
@@ -468,7 +469,7 @@
 							} else if let Some(Val::Str(n)) =
 								v.get("__intristic_namespace__".into())?
 							{
-								Ok(Val::Func(FuncVal::Intristic(n, s)))
+								Ok(Val::Func(Rc::new(FuncVal::Intristic(n, s))))
 							} else {
 								throw!(NoSuchField(s))
 							}
--- a/crates/jrsonnet-evaluator/src/function.rs
+++ b/crates/jrsonnet-evaluator/src/function.rs
@@ -1,7 +1,8 @@
 use crate::{error::Error::*, evaluate, lazy_val, resolved_lazy_val, throw, Context, Result, Val};
 use closure::closure;
 use jrsonnet_parser::{ArgsDesc, ParamsDesc};
-use std::{collections::HashMap, rc::Rc};
+use rustc_hash::FxHashMap;
+use std::{collections::HashMap, hash::BuildHasherDefault, rc::Rc};
 
 const NO_DEFAULT_CONTEXT: &str =
 	"no default context set for call with defined default parameter value";
@@ -20,7 +21,7 @@
 	args: &ArgsDesc,
 	tailstrict: bool,
 ) -> Result<Context> {
-	let mut out = HashMap::with_capacity(params.len());
+	let mut out = HashMap::with_capacity_and_hasher(params.len(), BuildHasherDefault::default());
 	let mut positioned_args = vec![None; params.0.len()];
 	for (id, arg) in args.iter().enumerate() {
 		let idx = if let Some(name) = &arg.0 {
@@ -67,7 +68,7 @@
 	args: &HashMap<Rc<str>, Val>,
 	tailstrict: bool,
 ) -> Result<Context> {
-	let mut out = HashMap::with_capacity(params.len());
+	let mut out = FxHashMap::with_capacity_and_hasher(params.len(), BuildHasherDefault::default());
 	let mut positioned_args = vec![None; params.0.len()];
 	for (name, val) in args.iter() {
 		let idx = params
@@ -115,7 +116,7 @@
 	params: &ParamsDesc,
 	args: &[Val],
 ) -> Result<Context> {
-	let mut out = HashMap::with_capacity(params.len());
+	let mut out = FxHashMap::with_capacity_and_hasher(params.len(), BuildHasherDefault::default());
 	let mut positioned_args = vec![None; params.0.len()];
 	for (id, arg) in args.iter().enumerate() {
 		if id >= params.len() {
--- a/crates/jrsonnet-evaluator/src/map.rs
+++ b/crates/jrsonnet-evaluator/src/map.rs
@@ -1,16 +1,17 @@
-use std::{borrow::Borrow, collections::HashMap, hash::Hash, rc::Rc};
+use rustc_hash::FxHashMap;
+use std::{borrow::Borrow, hash::Hash, rc::Rc};
 
 #[derive(Default, Debug)]
 struct LayeredHashMapInternals<K: Hash, V> {
 	parent: Option<LayeredHashMap<K, V>>,
-	current: HashMap<K, V>,
+	current: FxHashMap<K, V>,
 }
 
 #[derive(Debug)]
 pub struct LayeredHashMap<K: Hash, V>(Rc<LayeredHashMapInternals<K, V>>);
 
 impl<K: Hash + Eq, V> LayeredHashMap<K, V> {
-	pub fn extend(self, new_layer: HashMap<K, V>) -> Self {
+	pub fn extend(self, new_layer: FxHashMap<K, V>) -> Self {
 		match Rc::try_unwrap(self.0) {
 			Ok(mut map) => {
 				map.current.extend(new_layer);
@@ -45,7 +46,7 @@
 	fn default() -> Self {
 		LayeredHashMap(Rc::new(LayeredHashMapInternals {
 			parent: None,
-			current: HashMap::new(),
+			current: FxHashMap::default(),
 		}))
 	}
 }
--- a/crates/jrsonnet-evaluator/src/val.rs
+++ b/crates/jrsonnet-evaluator/src/val.rs
@@ -71,15 +71,16 @@
 	pub body: LocExpr,
 }
 
-#[derive(Debug, Clone)]
+#[derive(Debug)]
 pub enum FuncVal {
 	/// Plain function implemented in jsonnet
-	Normal(Rc<FuncDesc>),
+	Normal(FuncDesc),
 	/// Standard library function
 	Intristic(Rc<str>, Rc<str>),
 	/// Library functions implemented in native
 	NativeExt(Rc<str>, Rc<NativeCallback>),
 }
+
 impl PartialEq for FuncVal {
 	fn eq(&self, other: &Self) -> bool {
 		match (self, other) {
@@ -212,8 +213,9 @@
 	Lazy(LazyVal),
 	Arr(Rc<Vec<Val>>),
 	Obj(ObjValue),
-	Func(FuncVal),
+	Func(Rc<FuncVal>),
 }
+
 macro_rules! matches_unwrap {
 	($e: expr, $p: pat, $r: expr) => {
 		match $e {