diff --git a/Cargo.lock b/Cargo.lock
index 52cec81..b212afc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -244,6 +244,7 @@ dependencies = [
  "js-sys",
  "wasm-bindgen",
  "web-sys",
+ "wee_alloc",
  "yew",
 ]
 
@@ -299,6 +300,12 @@ dependencies = [
  "cfg-if 0.1.10",
 ]
 
+[[package]]
+name = "memory_units"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8452105ba047068f40ff7093dd1d9da90898e63dd61736462e9cdda6a90ad3c3"
+
 [[package]]
 name = "miniz_oxide"
 version = "0.4.3"
@@ -569,6 +576,18 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "wee_alloc"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dbb3b5a6b2bb17cb6ad44a2e68a43e8d2722c997da10e928665c72ec6c0a0b8e"
+dependencies = [
+ "cfg-if 0.1.10",
+ "libc",
+ "memory_units",
+ "winapi",
+]
+
 [[package]]
 name = "winapi"
 version = "0.3.9"
diff --git a/Cargo.toml b/Cargo.toml
index d294109..5d33142 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,6 +15,7 @@ gpx = "0.8.1"
 # yew = "0.19"
 yew = { git = "https://github.com/yewstack/yew.git" }
 gloo-file = "0.2"
+wee_alloc = "0.4"
 
 console_error_panic_hook = { version = "0.1.6", optional = true }
 
diff --git a/src/loader.rs b/src/loader.rs
index b7adc08..4d16a9f 100644
--- a/src/loader.rs
+++ b/src/loader.rs
@@ -2,7 +2,7 @@ use std::collections::HashMap;
 
 use gloo_file::callbacks::FileReader;
 use gloo_file::File;
-use web_sys::{Event, HtmlInputElement, MouseEvent, Url};
+use web_sys::{Event, HtmlInputElement, Url, MouseEvent};
 use yew::{html, html::TargetCast, Component, Context, Html};
 
 use super::utils;
@@ -83,7 +83,7 @@ impl Component for Loader {
                     Err(err) => {
                         utils::alert(&err.to_string());
                         ctx.link().send_message(Msg::Reset);
-                        return true;
+                        return true
                     }
                 };
 
@@ -94,9 +94,7 @@ impl Component for Loader {
                 let url = Url::create_object_url_with_blob(&merged).unwrap();
 
                 anchor_element.set_attribute("href", &url).unwrap();
-                anchor_element
-                    .set_attribute("download", "merged.gpx")
-                    .unwrap();
+                anchor_element.set_attribute("download", "merged.gpx").unwrap();
 
                 self.is_loading = false;
 
@@ -122,7 +120,7 @@ impl Component for Loader {
         let link = ctx.link();
         html! {
             if self.is_loading {
-                <span>{"loading..."}</span>
+                <span><strong>{"processing..."}</strong></span>
             } else {
                 <input type="file" value={self.field_value} multiple=true onchange={link.callback(move |e: Event| {
                     let mut result = Vec::new();
diff --git a/src/main.rs b/src/main.rs
index 5602a5f..434fbeb 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,13 @@
+extern crate wee_alloc;
+
 mod app;
 mod loader;
 mod utils;
 
+// Use `wee_alloc` as the global allocator.
+#[global_allocator]
+static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
+
 fn main() {
     yew::start_app::<app::App>();
 }