From d2e080427f47d3104310e878d4c3e7aef7c9a687 Mon Sep 17 00:00:00 2001
From: Cheong Lau <234708519+Cheong-Lau@users.noreply.github.com>
Date: Fri, 3 Oct 2025 23:25:51 +1000
Subject: [PATCH] perf: replace `rand` with `fastrand`

---
 Cargo.lock                               | 4 ++--
 cosmic-app-list/Cargo.toml               | 2 +-
 cosmic-app-list/src/app.rs               | 4 +---
 cosmic-applet-bluetooth/Cargo.toml       | 2 +-
 cosmic-applet-bluetooth/src/bluetooth.rs | 7 ++-----
 5 files changed, 7 insertions(+), 12 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index ef50f73b..1d46f8a2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1133,6 +1133,7 @@ dependencies = [
  "cosmic-app-list-config",
  "cosmic-client-toolkit",
  "cosmic-protocols",
+ "fastrand 2.3.0",
  "futures",
  "i18n-embed",
  "i18n-embed-fl",
@@ -1140,7 +1141,6 @@ dependencies = [
  "itertools 0.14.0",
  "libcosmic",
  "memmap2 0.9.8",
- "rand 0.9.2",
  "rust-embed",
  "rustix 1.1.2",
  "switcheroo-control",
@@ -1229,11 +1229,11 @@ dependencies = [
  "anyhow",
  "bluer",
  "cosmic-time",
+ "fastrand 2.3.0",
  "futures",
  "i18n-embed",
  "i18n-embed-fl",
  "libcosmic",
- "rand 0.9.2",
  "rust-embed",
  "tokio",
  "tracing",
diff --git a/cosmic-app-list/Cargo.toml b/cosmic-app-list/Cargo.toml
index 24d78f97..ead0dff4 100644
--- a/cosmic-app-list/Cargo.toml
+++ b/cosmic-app-list/Cargo.toml
@@ -16,7 +16,7 @@ image = { version = "0.25.8", default-features = false }
 itertools = "0.14.0"
 libcosmic.workspace = true
 memmap2 = "0.9.8"
-rand = "0.9.2"
+fastrand = "2.3.0"
 rust-embed.workspace = true
 rustix.workspace = true
 switcheroo-control = { git = "https://github.com/pop-os/dbus-settings-bindings" }
diff --git a/cosmic-app-list/src/app.rs b/cosmic-app-list/src/app.rs
index 75ce0a22..0cc66a0e 100755
--- a/cosmic-app-list/src/app.rs
+++ b/cosmic-app-list/src/app.rs
@@ -54,7 +54,6 @@ use cosmic_protocols::toplevel_info::v1::client::zcosmic_toplevel_handle_v1::Sta
 use futures::future::pending;
 use iced::{Alignment, Background, Length};
 use itertools::Itertools;
-use rand::{Rng, rng};
 use std::{borrow::Cow, collections::HashMap, path::PathBuf, rc::Rc, str::FromStr, time::Duration};
 use switcheroo_control::Gpu;
 use tokio::time::sleep;
@@ -1084,8 +1083,7 @@ impl cosmic::Application for CosmicAppList {
                         }
                         self.active_list.clear();
                         let subscription_ctr = self.subscription_ctr;
-                        let mut rng = rng();
-                        let rand_d = rng.random_range(0..100);
+                        let rand_d = fastrand::u64(0..100);
                         return iced::Task::perform(
                             async move {
                                 if let Some(millis) = 2u64
diff --git a/cosmic-applet-bluetooth/Cargo.toml b/cosmic-applet-bluetooth/Cargo.toml
index ca127f9f..a7d888f8 100644
--- a/cosmic-applet-bluetooth/Cargo.toml
+++ b/cosmic-applet-bluetooth/Cargo.toml
@@ -12,7 +12,7 @@ futures.workspace = true
 i18n-embed-fl.workspace = true
 i18n-embed.workspace = true
 libcosmic.workspace = true
-rand = "0.9"
+fastrand = "2.3.0"
 rust-embed.workspace = true
 tokio.workspace = true
 tracing-log.workspace = true
diff --git a/cosmic-applet-bluetooth/src/bluetooth.rs b/cosmic-applet-bluetooth/src/bluetooth.rs
index 5cf94b3b..5c7f8c67 100644
--- a/cosmic-applet-bluetooth/src/bluetooth.rs
+++ b/cosmic-applet-bluetooth/src/bluetooth.rs
@@ -24,7 +24,6 @@ use cosmic::{
 };
 
 use futures::{FutureExt, stream::FuturesUnordered};
-use rand::Rng;
 use tokio::{
     spawn,
     sync::{
@@ -397,8 +396,7 @@ impl BluerSessionState {
                             ),
                         ))
                         .await;
-                    let mut rng = rand::rng();
-                    let pin_code = rng.random_range(0..999999);
+                    let pin_code = fastrand::u32(0..999999);
                     Ok(format!("{:06}", pin_code))
                 })
             })),
@@ -437,8 +435,7 @@ impl BluerSessionState {
                             ),
                         ))
                         .await;
-                    let mut rng = rand::rng();
-                    let pin_code = rng.random_range(0..999999);
+                    let pin_code = fastrand::u32(0..999999);
                     Ok(pin_code)
                 })
             })),