Use jemalloc

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;