diff --git a/Cargo.lock b/Cargo.lock
index f6ee4df5743..97df8d2eee3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -7,7 +7,6 @@ dependencies = [
  "criterion",
  "gc",
  "gc_derive",
- "jemallocator",
  "rand",
  "regex",
  "serde",
@@ -61,7 +60,6 @@ name = "boa_cli"
 version = "0.6.0"
 dependencies = [
  "Boa",
- "jemallocator",
  "structopt",
 ]
 
@@ -98,12 +96,6 @@ dependencies = [
  "rustc_version",
 ]
 
-[[package]]
-name = "cc"
-version = "1.0.50"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "95e28fa049fda1c330bcf9d723be7663a899c4679724b34c81e9f5a326aab8cd"
-
 [[package]]
 name = "cfg-if"
 version = "0.1.10"
@@ -235,12 +227,6 @@ version = "1.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bb1f6b1ce1c140482ea30ddd3335fc0024ac7ee112895426e0a629a6c20adfe3"
 
-[[package]]
-name = "fs_extra"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5f2a4a2034423744d2cc7ca2068453168dcdb82c438419e639a26bd87839c674"
-
 [[package]]
 name = "gc"
 version = "0.3.3"
@@ -302,27 +288,6 @@ version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b8b7a7c0c47db5545ed3fef7468ee7bb5b74691498139e4b3f6a20685dc6dd8e"
 
-[[package]]
-name = "jemalloc-sys"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0d3b9f3f5c9b31aa0f5ed3260385ac205db665baa41d49bb8338008ae94ede45"
-dependencies = [
- "cc",
- "fs_extra",
- "libc",
-]
-
-[[package]]
-name = "jemallocator"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "43ae63fcfc45e99ab3d1b29a46782ad679e98436c3169d15a167a1108a724b69"
-dependencies = [
- "jemalloc-sys",
- "libc",
-]
-
 [[package]]
 name = "js-sys"
 version = "0.3.37"
diff --git a/boa/Cargo.toml b/boa/Cargo.toml
index 084f1066af0..2d4c7150a38 100644
--- a/boa/Cargo.toml
+++ b/boa/Cargo.toml
@@ -27,7 +27,6 @@ serde = { version = "1.0.105", features = ["derive"], optional = true }
 
 [dev-dependencies]
 criterion = "0.3.1"
-jemallocator = "0.3.2"
 
 [lib]
 crate-type = ["cdylib", "lib"]
diff --git a/boa/benches/exec.rs b/boa/benches/exec.rs
index 79ed23b6877..380dcffa8b5 100644
--- a/boa/benches/exec.rs
+++ b/boa/benches/exec.rs
@@ -1,8 +1,9 @@
-use boa::{exec, realm::Realm};
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
+#[macro_use]
+extern crate criterion;
 
-#[global_allocator]
-static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;
+use boa::exec;
+use boa::realm::Realm;
+use criterion::{black_box, Criterion};
 
 static SRC: &str = r#"
 let a = Symbol();
diff --git a/boa/benches/fib.rs b/boa/benches/fib.rs
index 0ffbe919a27..09af95c222f 100644
--- a/boa/benches/fib.rs
+++ b/boa/benches/fib.rs
@@ -1,8 +1,9 @@
-use boa::exec;
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
+#[macro_use]
+extern crate criterion;
 
-#[global_allocator]
-static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;
+use boa::exec;
+use criterion::black_box;
+use criterion::Criterion;
 
 static SRC: &str = r#"
 let num = 12;
diff --git a/boa/benches/parser.rs b/boa/benches/parser.rs
index 601e17f7ab2..5c697a174ec 100644
--- a/boa/benches/parser.rs
+++ b/boa/benches/parser.rs
@@ -1,8 +1,10 @@
-use boa::syntax::{lexer::Lexer, parser::Parser};
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
+#[macro_use]
+extern crate criterion;
 
-#[global_allocator]
-static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;
+use boa::syntax::lexer::Lexer;
+use boa::syntax::parser::Parser;
+use criterion::black_box;
+use criterion::Criterion;
 
 static EXPRESSION: &str = r#"
 1 + 1 + 1 + 1 + 1 + 1 / 1 + 1 + 1 * 1 + 1 + 1 + 1;
diff --git a/boa/benches/string.rs b/boa/benches/string.rs
index 5adc15d5eef..2a7b275a299 100644
--- a/boa/benches/string.rs
+++ b/boa/benches/string.rs
@@ -1,11 +1,11 @@
-use boa::{
-    exec,
-    syntax::{lexer::Lexer, parser::Parser},
-};
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
+#[macro_use]
+extern crate criterion;
 
-#[global_allocator]
-static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;
+use boa::exec;
+use boa::syntax::lexer::Lexer;
+use boa::syntax::parser::Parser;
+use criterion::black_box;
+use criterion::Criterion;
 
 static SRC: &str = "let foo = 'hello world!'; foo;";
 
diff --git a/boa_cli/Cargo.toml b/boa_cli/Cargo.toml
index fa0e704b63a..abd015bcee6 100644
--- a/boa_cli/Cargo.toml
+++ b/boa_cli/Cargo.toml
@@ -13,4 +13,3 @@ edition = "2018"
 [dependencies]
 Boa = { path = "../boa", features = ["serde-ast"], default-features = false }
 structopt = "0.3.12"
-jemallocator = "0.3.2"
\ No newline at end of file
diff --git a/boa_cli/src/main.rs b/boa_cli/src/main.rs
index b4142489eb5..38741d591d0 100644
--- a/boa_cli/src/main.rs
+++ b/boa_cli/src/main.rs
@@ -1,47 +1,15 @@
-#![deny(
-    unused_qualifications,
-    clippy::all,
-    unused_qualifications,
-    unused_import_braces,
-    unused_lifetimes,
-    unreachable_pub,
-    trivial_numeric_casts,
-    rustdoc,
-    missing_debug_implementations,
-    missing_copy_implementations,
-    deprecated_in_future,
-    non_ascii_idents,
-    rust_2018_compatibility,
-    rust_2018_idioms,
-    future_incompatible,
-    nonstandard_style
-)]
-#![warn(clippy::perf, clippy::single_match_else, clippy::dbg_macro)]
-#![allow(
-    clippy::missing_inline_in_public_items,
-    clippy::cognitive_complexity,
-    clippy::must_use_candidate,
-    clippy::missing_errors_doc,
-    clippy::as_conversions
-)]
-
-use boa::{
-    builtins::console::log,
-    exec::Executor,
-    forward_val,
-    realm::Realm,
-    serde_json,
-    syntax::ast::{node::Node, token::Token},
-};
-use std::{
-    fs::read_to_string,
-    io::{self, Write},
-    path::PathBuf,
-};
-use structopt::{clap::arg_enum, StructOpt};
-
-#[global_allocator]
-static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;
+#![deny(unused_qualifications, clippy::correctness, clippy::style)]
+#![warn(clippy::perf)]
+#![allow(clippy::cognitive_complexity)]
+
+use boa::builtins::console::log;
+use boa::serde_json;
+use boa::syntax::ast::{node::Node, token::Token};
+use boa::{exec::Executor, forward_val, realm::Realm};
+use std::io::{self, Write};
+use std::{fs::read_to_string, path::PathBuf};
+use structopt::clap::arg_enum;
+use structopt::StructOpt;
 
 /// CLI configuration for Boa.
 //