diff --git a/Cargo.lock b/Cargo.lock
index 04ad762..cf93e0e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2471,6 +2471,7 @@ dependencies = [
  "slint",
  "slint-build",
  "thumbhash",
+ "tikv-jemallocator",
  "tokio",
  "tracing",
  "tracing-subscriber",
@@ -5289,6 +5290,26 @@ dependencies = [
  "zune-jpeg",
 ]
 
+[[package]]
+name = "tikv-jemalloc-sys"
+version = "0.6.1+5.3.0-1-ge13ca993e8ccb9ba9847cc330696e02839f328f7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cd8aa5b2ab86a2cefa406d889139c162cbb230092f7d1d7cbc1716405d852a3b"
+dependencies = [
+ "cc",
+ "libc",
+]
+
+[[package]]
+name = "tikv-jemallocator"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0359b4327f954e0567e69fb191cf1436617748813819c94b8cd4a431422d053a"
+dependencies = [
+ "libc",
+ "tikv-jemalloc-sys",
+]
+
 [[package]]
 name = "tiny-skia"
 version = "0.11.4"
diff --git a/Cargo.toml b/Cargo.toml
index 415af0d..47c684a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,6 +20,7 @@ tokio = { version = "1.51.0", features = ["full"] }
 tracing = "0.1.44"
 tracing-subscriber = { version = "0.3.23", features = ["env-filter"] }
 xdg = "3.0.0"
+tikv-jemallocator = "0.6"
 
 [dependencies.slint]
 version = "1.16.1"
diff --git a/src/main.rs b/src/main.rs
index 617bf1d..ca541e7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -16,6 +16,10 @@ use crate::{
     ui::{AppWindow, ImageBucket},
 };
 
+/// Use jemalloc to reduce memory fragmentation.
+#[global_allocator]
+static ALLOCATOR: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;
+
 mod api;
 pub mod cachemap;
 mod thumbhash;