diff --git a/Cargo.lock b/Cargo.lock
index 15a5664..0318b3a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -8,6 +8,14 @@ dependencies = [
  "const-random 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "ahash"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "const-random 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "aho-corasick"
 version = "0.7.6"
@@ -44,6 +52,11 @@ name = "autocfg"
 version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "autocfg"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "backtrace"
 version = "0.3.15"
@@ -445,6 +458,7 @@ dependencies = [
  "criterion 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "dotenv 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hashbrown 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "lru 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "postgres 0.17.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -650,6 +664,15 @@ dependencies = [
  "autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ahash 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "headers"
 version = "0.2.1"
@@ -2378,11 +2401,13 @@ dependencies = [
 
 [metadata]
 "checksum ahash 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)" = "6f33b5018f120946c1dcf279194f238a9f146725593ead1c08fa47ff22b0b5d3"
+"checksum ahash 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "0989268a37e128d4d7a8028f1c60099430113fdbc70419010601ce51a228e4fe"
 "checksum aho-corasick 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)" = "58fb5e95d83b38284460a5fda7d6470aa0b8844d283a0b614b8535e880800d2d"
 "checksum antidote 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "34fde25430d87a9388dadbe6e34d7f72a462c8b43ac8d309b42b0a8505d7e2a5"
 "checksum arrayvec 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)" = "92c7fb76bc8826a8b33b4ee5bb07a247a81e76764ab4d55e8f73e3a4d8808c71"
 "checksum atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "9a7d5b8723950951411ee34d271d99dddcc2035a16ab25310ea2c8cfd4369652"
 "checksum autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "1d49d90015b3c36167a20fe2810c5cd875ad504b39cff3d4eae7977e6b7c1cb2"
+"checksum autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f8aac770f1885fd7e387acedd76065302551364496e46b3dd00860b2f8359b9d"
 "checksum backtrace 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "f106c02a3604afcdc0df5d36cc47b44b55917dbaf3d808f71c163a0ddba64637"
 "checksum backtrace-sys 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)" = "797c830ac25ccc92a7f8a7b9862bde440715531514594a6154e3d4a54dd769b6"
 "checksum base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0b25d992356d2eb0ed82172f5248873db5560c4721f564b13cb5193bda5e668e"
@@ -2450,6 +2475,7 @@ dependencies = [
 "checksum getrandom 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "473a1265acc8ff1e808cd0a1af8cee3c2ee5200916058a2ca113c29f2d903571"
 "checksum h2 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)" = "85ab6286db06040ddefb71641b50017c06874614001a134b423783e2db2920bd"
 "checksum hashbrown 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "8e6073d0ca812575946eb5f35ff68dbe519907b25c42530389ff946dc84c6ead"
+"checksum hashbrown 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "479e9d9a1a3f8c489868a935b557ab5710e3e223836da2ecd52901d88935cb56"
 "checksum headers 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dc6e2e51d356081258ef05ff4c648138b5d3fe64b7300aaad3b820554a2b7fb6"
 "checksum headers-core 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "51ae5b0b5417559ee1d2733b21d33b0868ae9e406bd32eb1a51d613f66ed472a"
 "checksum headers-derive 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "97c462e8066bca4f0968ddf8d12de64c40f2c2187b3b9a2fa994d06e8ad444a9"
diff --git a/Cargo.toml b/Cargo.toml
index eb1a7ef..bd642ae 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,6 +25,7 @@ r2d2_postgres = "0.16.0"
 r2d2 = "0.8.8"
 lru = "0.4.3"
 urlencoding = "1.0.0"
+hashbrown = "0.7.1"
 
 [dev-dependencies]
 criterion = "0.3"
@@ -44,4 +45,6 @@ production = []
 [profile.release]
 lto = "fat"
 panic = "abort"
+codegen-units = 1
+
 
diff --git a/src/config/environmental_variables.rs b/src/config/environmental_variables.rs
index 6588765..960ce7c 100644
--- a/src/config/environmental_variables.rs
+++ b/src/config/environmental_variables.rs
@@ -1,4 +1,5 @@
-use std::{collections::HashMap, fmt};
+use hashbrown::HashMap;
+use std::fmt;
 
 pub struct EnvVar(pub HashMap<String, String>);
 impl std::ops::Deref for EnvVar {
diff --git a/src/messages/event/checked_event/status/mod.rs b/src/messages/event/checked_event/status/mod.rs
index 427bc17..8656231 100644
--- a/src/messages/event/checked_event/status/mod.rs
+++ b/src/messages/event/checked_event/status/mod.rs
@@ -9,9 +9,10 @@ use {application::Application, attachment::Attachment, card::Card, poll::Poll};
 use crate::log_fatal;
 use crate::parse_client_request::Blocks;
 
+use hashbrown::HashSet;
 use serde::{Deserialize, Serialize};
 use std::boxed::Box;
-use std::{collections::HashSet, string::String};
+use std::string::String;
 
 #[serde(deny_unknown_fields)]
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq)]
diff --git a/src/messages/event/dynamic_event.rs b/src/messages/event/dynamic_event.rs
index 45ed3ba..9bff2fd 100644
--- a/src/messages/event/dynamic_event.rs
+++ b/src/messages/event/dynamic_event.rs
@@ -1,7 +1,7 @@
 use crate::parse_client_request::Blocks;
+use hashbrown::HashSet;
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
-use std::collections::HashSet;
 
 #[derive(Deserialize, Serialize, Debug, Clone, PartialEq)]
 pub struct DynamicEvent {
diff --git a/src/messages/test.rs b/src/messages/test.rs
index 12b0190..c6d82ae 100644
--- a/src/messages/test.rs
+++ b/src/messages/test.rs
@@ -1,5 +1,5 @@
 use super::*;
-use std::collections::HashMap;
+use hashbrown::HashMap;
 
 #[serde(rename_all = "snake_case")]
 #[derive(Deserialize, Debug, Clone, PartialEq)]
diff --git a/src/parse_client_request/postgres.rs b/src/parse_client_request/postgres.rs
index 4bb1348..d3120cf 100644
--- a/src/parse_client_request/postgres.rs
+++ b/src/parse_client_request/postgres.rs
@@ -4,8 +4,8 @@ use crate::{
     parse_client_request::subscription::{Scope, UserData},
 };
 use ::postgres;
+use hashbrown::HashSet;
 use r2d2_postgres::PostgresConnectionManager;
-use std::collections::HashSet;
 use warp::reject::Rejection;
 
 #[derive(Clone, Debug)]
diff --git a/src/parse_client_request/subscription.rs b/src/parse_client_request/subscription.rs
index 61f9456..783ee3c 100644
--- a/src/parse_client_request/subscription.rs
+++ b/src/parse_client_request/subscription.rs
@@ -9,8 +9,8 @@ use super::postgres::PgPool;
 use super::query::Query;
 use crate::err::TimelineErr;
 use crate::log_fatal;
+use hashbrown::HashSet;
 use lru::LruCache;
-use std::collections::HashSet;
 use uuid::Uuid;
 use warp::reject::Rejection;
 
diff --git a/src/redis_to_client_stream/receiver/message_queues.rs b/src/redis_to_client_stream/receiver/message_queues.rs
index 9044460..ace23d8 100644
--- a/src/redis_to_client_stream/receiver/message_queues.rs
+++ b/src/redis_to_client_stream/receiver/message_queues.rs
@@ -1,10 +1,8 @@
 use crate::messages::Event;
 use crate::parse_client_request::Timeline;
 
-use std::{
-    collections::{HashMap, VecDeque},
-    fmt,
-};
+use hashbrown::HashMap;
+use std::{collections::VecDeque, fmt};
 use uuid::Uuid;
 
 #[derive(Clone)]
diff --git a/src/redis_to_client_stream/receiver/mod.rs b/src/redis_to_client_stream/receiver/mod.rs
index b78fb28..2df1cbc 100644
--- a/src/redis_to_client_stream/receiver/mod.rs
+++ b/src/redis_to_client_stream/receiver/mod.rs
@@ -15,14 +15,17 @@ use crate::{
     parse_client_request::{Stream, Subscription, Timeline},
 };
 
-use futures::{Async, Poll};
+use {
+    futures::{Async, Poll},
+    hashbrown::HashMap,
+    uuid::Uuid,
+};
+
 use std::{
-    collections::HashMap,
     result,
     sync::{Arc, Mutex},
     time::{Duration, Instant},
 };
-use uuid::Uuid;
 
 type Result<T> = result::Result<T, ReceiverErr>;