diff --git a/Cargo.lock b/Cargo.lock
index e92a7c6d7a..885b28f1f3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -18,6 +18,7 @@ checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 name = "bootstrap"
 version = "0.0.0"
 dependencies = [
+ "hashbrown",
  "linked_list_allocator",
  "redox-exec",
  "redox-initfs",
@@ -35,6 +36,12 @@ dependencies = [
  "scroll",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.14.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "290f1a1d9242c78d09ce40a5e87e7554ee637af1351968159f4952f028f75604"
+
 [[package]]
 name = "linked_list_allocator"
 version = "0.10.5"
diff --git a/Cargo.toml b/Cargo.toml
index cfb3538b4c..feb816d5e8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,6 +10,7 @@ name = "bootstrap"
 crate-type = ["staticlib"]
 
 [dependencies]
+hashbrown = { version = "0.14", default-features = false, features = ["inline-more"] }
 linked_list_allocator = "0.10"
 redox-initfs = { git = "https://gitlab.redox-os.org/redox-os/redox-initfs.git", features = ["kernel"], default-features = false }
 redox-exec = { git = "https://gitlab.redox-os.org/redox-os/relibc.git" }
@@ -17,6 +18,7 @@ redox_syscall = "0.4"
 
 [profile.release]
 panic = "abort"
+lto = "fat"
 
 [profile.dev]
 panic = "abort"
diff --git a/src/aarch64.ld b/src/aarch64.ld
index a3c3b3b65c..3abb18108d 100644
--- a/src/aarch64.ld
+++ b/src/aarch64.ld
@@ -1,4 +1,4 @@
-ENTRY(ustart)
+ENTRY(_start)
 OUTPUT_FORMAT("elf64-littleaarch64", "elf64-littleaarch64", "elf64-littleaarch64")
 
 SECTIONS {
@@ -34,7 +34,6 @@ SECTIONS {
     . = ALIGN(4096);
     __bss_end = .;
   }
-  __end = .;
 
   /DISCARD/ : {
       *(.comment*)
diff --git a/src/aarch64.rs b/src/aarch64.rs
index 964c2c46e7..f94d41d37f 100644
--- a/src/aarch64.rs
+++ b/src/aarch64.rs
@@ -20,8 +20,8 @@ static MAP: Map = Map {
 
 core::arch::global_asm!(
     "
-    .globl ustart
-    ustart:
+    .globl _start
+    _start:
     // Setup a stack.
     ldr x8, ={number}
     ldr x0, ={fd}
diff --git a/src/i686.ld b/src/i686.ld
index 90bd467067..e07ab63713 100644
--- a/src/i686.ld
+++ b/src/i686.ld
@@ -1,4 +1,4 @@
-ENTRY(ustart)
+ENTRY(_start)
 OUTPUT_FORMAT(elf32-i386)
 
 SECTIONS {
@@ -34,7 +34,6 @@ SECTIONS {
     . = ALIGN(4096);
     __bss_end = .;
   }
-  __end = .;
 
   /DISCARD/ : {
       *(.comment*)
diff --git a/src/i686.rs b/src/i686.rs
index 2a0beac59b..f07beb4397 100644
--- a/src/i686.rs
+++ b/src/i686.rs
@@ -15,9 +15,9 @@ static MAP: Map = Map {
 };
 
 core::arch::global_asm!(
-"
-    .globl ustart
-    ustart:
+    "
+    .globl _start
+    _start:
     # Setup a stack.
     mov eax, {number}
     mov ebx, {fd}
diff --git a/src/initfs.rs b/src/initfs.rs
index 7303134594..e4ed8d4951 100644
--- a/src/initfs.rs
+++ b/src/initfs.rs
@@ -1,9 +1,11 @@
 use core::convert::TryFrom;
+#[allow(deprecated)]
+use core::hash::{BuildHasherDefault, SipHasher};
 use core::str;
 
-use alloc::collections::BTreeMap;
 use alloc::string::String;
 
+use hashbrown::HashMap;
 use redox_initfs::{InitFs, InodeStruct, Inode, InodeDir, InodeKind, types::Timespec};
 
 use syscall::data::{Packet, Stat};
@@ -19,14 +21,15 @@ struct Handle {
     filename: String,
 }
 pub struct InitFsScheme {
-    handles: BTreeMap<usize, Handle>,
+    #[allow(deprecated)]
+    handles: HashMap<usize, Handle, BuildHasherDefault<SipHasher>>,
     next_id: usize,
     fs: InitFs<'static>,
 }
 impl InitFsScheme {
     pub fn new(bytes: &'static [u8]) -> Self {
         Self {
-            handles: BTreeMap::new(),
+            handles: HashMap::default(),
             next_id: 0,
             fs: InitFs::new(bytes).expect("failed to parse initfs"),
         }
diff --git a/src/start.rs b/src/start.rs
index c05980865c..920f285645 100644
--- a/src/start.rs
+++ b/src/start.rs
@@ -11,8 +11,6 @@ mod offsets {
         // data+bss (RW-)
         static __data_start: u8;
         static __bss_end: u8;
-
-        static __end: u8;
     }
     pub fn text() -> (usize, usize) {
         unsafe { (&__text_start as *const u8 as usize, &__text_end as *const u8 as usize) }
diff --git a/src/x86_64.ld b/src/x86_64.ld
index c8c89bc868..232fbf72fc 100644
--- a/src/x86_64.ld
+++ b/src/x86_64.ld
@@ -1,4 +1,4 @@
-ENTRY(ustart)
+ENTRY(_start)
 OUTPUT_FORMAT(elf64-x86-64)
 
 SECTIONS {
@@ -34,7 +34,6 @@ SECTIONS {
     . = ALIGN(4096);
     __bss_end = .;
   }
-  __end = .;
 
   /DISCARD/ : {
       *(.comment*)
diff --git a/src/x86_64.rs b/src/x86_64.rs
index b1e7343e53..c4c051ca0a 100644
--- a/src/x86_64.rs
+++ b/src/x86_64.rs
@@ -17,8 +17,8 @@ static MAP: Map = Map {
 
 core::arch::global_asm!(
     "
-    .globl ustart
-    ustart:
+    .globl _start
+    _start:
     # Setup a stack.
     mov rax, {number}
     mov rdi, {fd}