diff --git a/crates/eframe/src/native/run.rs b/crates/eframe/src/native/run.rs
index 1f83bdab5b9..5f747b32318 100644
--- a/crates/eframe/src/native/run.rs
+++ b/crates/eframe/src/native/run.rs
@@ -459,7 +459,8 @@ fn run_and_exit(event_loop: EventLoop<UserEvent>, mut winit_app: impl WinitApp +
 mod glow_integration {
 
     use egui::{
-        epaint::ahash::HashMap, NumExt as _, ViewportIdPair, ViewportOutput, ViewportUiCallback,
+        epaint::ahash::HashMap, NumExt as _, ViewportIdPair, ViewportMap, ViewportOutput,
+        ViewportUiCallback,
     };
     use egui_winit::{
         changes_between_builders, create_winit_window_builder, process_viewport_commands,
@@ -532,11 +533,11 @@ mod glow_integration {
         current_gl_context: Option<glutin::context::PossiblyCurrentContext>,
         not_current_gl_context: Option<glutin::context::NotCurrentContext>,
 
-        viewports: HashMap<ViewportId, Rc<RefCell<Viewport>>>,
+        viewports: ViewportMap<Rc<RefCell<Viewport>>>,
         viewport_maps: HashMap<winit::window::WindowId, ViewportId>,
-        window_maps: HashMap<ViewportId, winit::window::WindowId>,
+        window_maps: ViewportMap<winit::window::WindowId>,
 
-        builders: HashMap<ViewportId, ViewportBuilder>,
+        builders: ViewportMap<ViewportBuilder>,
     }
 
     impl GlutinWindowContext {
@@ -659,13 +660,13 @@ mod glow_integration {
             let not_current_gl_context = Some(gl_context);
 
             let mut viewport_maps = HashMap::default();
-            let mut window_maps = HashMap::default();
+            let mut window_maps = ViewportMap::default();
             if let Some(window) = &window {
                 viewport_maps.insert(window.id(), ViewportId::MAIN);
                 window_maps.insert(ViewportId::MAIN, window.id());
             }
 
-            let mut windows = HashMap::default();
+            let mut windows = ViewportMap::default();
             windows.insert(
                 ViewportId::MAIN,
                 Rc::new(RefCell::new(Viewport {
@@ -677,7 +678,7 @@ mod glow_integration {
                 })),
             );
 
-            let mut builders = HashMap::default();
+            let mut builders = ViewportMap::default();
             builders.insert(ViewportId::MAIN, window_builder);
 
             // the fun part with opengl gl is that we never know whether there is an error. the context creation might have failed, but
@@ -1887,7 +1888,7 @@ pub use glow_integration::run_glow;
 
 #[cfg(feature = "wgpu")]
 mod wgpu_integration {
-    use egui::{ViewportIdPair, ViewportOutput, ViewportUiCallback};
+    use egui::{ViewportIdPair, ViewportMap, ViewportOutput, ViewportUiCallback};
     use egui_winit::create_winit_window_builder;
     use parking_lot::Mutex;
 
@@ -1906,10 +1907,10 @@ mod wgpu_integration {
     }
 
     #[derive(Clone, Default)]
-    pub struct Viewports(HashMap<ViewportId, Viewport>);
+    pub struct Viewports(ViewportMap<Viewport>);
 
     impl std::ops::Deref for Viewports {
-        type Target = HashMap<ViewportId, Viewport>;
+        type Target = ViewportMap<Viewport>;
 
         fn deref(&self) -> &Self::Target {
             &self.0
@@ -1930,7 +1931,7 @@ mod wgpu_integration {
         integration: Rc<RefCell<epi_integration::EpiIntegration>>,
         app: Box<dyn epi::App>,
         viewports: Rc<RefCell<Viewports>>,
-        builders: Rc<RefCell<HashMap<ViewportId, ViewportBuilder>>>,
+        builders: Rc<RefCell<ViewportMap<ViewportBuilder>>>,
         viewport_maps: Rc<RefCell<HashMap<winit::window::WindowId, ViewportId>>>,
     }
 
@@ -2177,7 +2178,7 @@ mod wgpu_integration {
                 },
             );
 
-            let builders = Rc::new(RefCell::new(HashMap::default()));
+            let builders = Rc::new(RefCell::new(ViewportMap::default()));
             builders.borrow_mut().insert(ViewportId::MAIN, builder);
 
             let painter = Rc::new(RefCell::new(painter));
@@ -2242,7 +2243,7 @@ mod wgpu_integration {
             id_pair: ViewportIdPair,
             viewport_ui_cb: Box<dyn FnOnce(&egui::Context) + '_>,
             viewports: &RefCell<Viewports>,
-            builders: &RefCell<HashMap<ViewportId, ViewportBuilder>>,
+            builders: &RefCell<ViewportMap<ViewportBuilder>>,
             beginning: Instant,
             painter: &RefCell<egui_wgpu::winit::Painter>,
             viewport_maps: &RefCell<HashMap<winit::window::WindowId, ViewportId>>,
diff --git a/crates/egui-wgpu/src/winit.rs b/crates/egui-wgpu/src/winit.rs
index 4b7c058db91..d3ad80ca81c 100644
--- a/crates/egui-wgpu/src/winit.rs
+++ b/crates/egui-wgpu/src/winit.rs
@@ -1,7 +1,6 @@
 use std::{num::NonZeroU32, sync::Arc};
 
-use egui::ViewportId;
-use epaint::ahash::HashMap;
+use egui::{ViewportId, ViewportMap};
 
 use crate::{renderer, RenderState, SurfaceErrorAction, WgpuConfiguration};
 
@@ -80,13 +79,13 @@ pub struct Painter {
     msaa_samples: u32,
     support_transparent_backbuffer: bool,
     depth_format: Option<wgpu::TextureFormat>,
-    depth_texture_view: HashMap<ViewportId, wgpu::TextureView>,
-    msaa_texture_view: HashMap<ViewportId, wgpu::TextureView>,
+    depth_texture_view: ViewportMap<wgpu::TextureView>,
+    msaa_texture_view: ViewportMap<wgpu::TextureView>,
     screen_capture_state: Option<CaptureState>,
 
     instance: wgpu::Instance,
     render_state: Option<RenderState>,
-    surfaces: HashMap<ViewportId, SurfaceState>,
+    surfaces: ViewportMap<SurfaceState>,
 }
 
 unsafe impl Send for Painter {}
@@ -121,13 +120,13 @@ impl Painter {
             msaa_samples,
             support_transparent_backbuffer,
             depth_format,
-            depth_texture_view: HashMap::default(),
+            depth_texture_view: Default::default(),
             screen_capture_state: None,
 
             instance,
             render_state: None,
-            surfaces: HashMap::default(),
-            msaa_texture_view: HashMap::default(),
+            surfaces: Default::default(),
+            msaa_texture_view: Default::default(),
         }
     }
 
diff --git a/crates/egui/src/context.rs b/crates/egui/src/context.rs
index 76128d89762..62d7248932c 100644
--- a/crates/egui/src/context.rs
+++ b/crates/egui/src/context.rs
@@ -59,13 +59,13 @@ struct Repaint {
     /// The current frame number.
     ///
     /// Incremented at the end of each frame.
-    viewports_frame_nr: HashMap<ViewportId, u64>,
+    viewports_frame_nr: ViewportMap<u64>,
 
     /// While positive, keep requesting repaints. Decrement at the start of each frame.
-    repaint_request: HashMap<ViewportId, u8>,
+    repaint_request: ViewportMap<u8>,
     request_repaint_callback: Option<Box<dyn Fn(RequestRepaintInfo) + Send + Sync>>,
 
-    requested_repaint_last_frame: HashMap<ViewportId, bool>,
+    requested_repaint_last_frame: ViewportMap<bool>,
 }
 
 impl Repaint {
@@ -154,23 +154,23 @@ struct ContextImpl {
 
     os: OperatingSystem,
 
-    input: HashMap<ViewportId, InputState>,
+    input: ViewportMap<InputState>,
 
     /// State that is collected during a frame and then cleared
-    frame_state: HashMap<ViewportId, FrameState>,
+    frame_state: ViewportMap<FrameState>,
 
     /// How deeply nested are we?
     viewport_stack: Vec<ViewportIdPair>,
 
     // The output of a frame:
-    graphics: HashMap<ViewportId, GraphicLayers>,
-    output: HashMap<ViewportId, PlatformOutput>,
+    graphics: ViewportMap<GraphicLayers>,
+    output: ViewportMap<PlatformOutput>,
 
     paint_stats: PaintStats,
 
     repaint: Repaint,
 
-    viewports: HashMap<ViewportId, Viewport>,
+    viewports: ViewportMap<Viewport>,
     viewport_commands: Vec<(ViewportId, ViewportCommand)>,
 
     is_desktop: bool,
@@ -178,11 +178,11 @@ struct ContextImpl {
 
     /// Written to during the frame.
     layer_rects_this_frame: ahash::HashMap<LayerId, Vec<(Id, Rect)>>,
-    layer_rects_this_viewports: HashMap<ViewportId, HashMap<LayerId, Vec<(Id, Rect)>>>,
+    layer_rects_this_viewports: ViewportMap<HashMap<LayerId, Vec<(Id, Rect)>>>,
 
     /// Read
     layer_rects_prev_frame: ahash::HashMap<LayerId, Vec<(Id, Rect)>>,
-    layer_rects_prev_viewports: HashMap<ViewportId, HashMap<LayerId, Vec<(Id, Rect)>>>,
+    layer_rects_prev_viewports: ViewportMap<HashMap<LayerId, Vec<(Id, Rect)>>>,
 
     #[cfg(feature = "accesskit")]
     is_accesskit_enabled: bool,
diff --git a/crates/egui/src/memory.rs b/crates/egui/src/memory.rs
index 8dcfe136595..b4993474f8c 100644
--- a/crates/egui/src/memory.rs
+++ b/crates/egui/src/memory.rs
@@ -1,10 +1,11 @@
 #![warn(missing_docs)] // Let's keep this file well-documented.` to memory.rs
 
+use epaint::{emath::Rangef, vec2, Vec2};
+
 use crate::{
     area, window, EventFilter, Id, IdMap, InputState, LayerId, Pos2, Rect, Style, ViewportId,
+    ViewportMap,
 };
-use ahash::HashMap;
-use epaint::{emath::Rangef, vec2, Vec2};
 
 // ----------------------------------------------------------------------------
 
@@ -77,7 +78,7 @@ pub struct Memory {
     pub(crate) new_font_definitions: Option<epaint::text::FontDefinitions>,
 
     #[cfg_attr(feature = "persistence", serde(skip))]
-    pub(crate) interactions: HashMap<ViewportId, Interaction>,
+    pub(crate) interactions: ViewportMap<Interaction>,
 
     #[cfg_attr(feature = "persistence", serde(skip))]
     pub(crate) interaction: Interaction,
@@ -90,7 +91,7 @@ pub struct Memory {
     pub(crate) window_interaction: Option<window::WindowInteraction>,
 
     #[cfg_attr(feature = "persistence", serde(skip))]
-    pub(crate) window_interactions: HashMap<ViewportId, window::WindowInteraction>,
+    pub(crate) window_interactions: ViewportMap<window::WindowInteraction>,
 
     #[cfg_attr(feature = "persistence", serde(skip))]
     pub(crate) drag_value: crate::widgets::drag_value::MonoState,
@@ -99,7 +100,7 @@ pub struct Memory {
     pub(crate) areas: Areas,
 
     #[cfg_attr(feature = "persistence", serde(skip))]
-    pub(crate) viewports_areas: HashMap<ViewportId, Areas>,
+    pub(crate) viewports_areas: ViewportMap<Areas>,
 
     /// Which popup-window is open (if any)?
     /// Could be a combo box, color picker, menu etc.
diff --git a/crates/egui/src/viewport.rs b/crates/egui/src/viewport.rs
index 846aa5da9d0..905ed357850 100644
--- a/crates/egui/src/viewport.rs
+++ b/crates/egui/src/viewport.rs
@@ -49,6 +49,11 @@ impl From<ViewportId> for Id {
     }
 }
 
+impl nohash_hasher::IsEnabled for ViewportId {}
+
+/// A fast hash map from [`ViewportId`] to `T`.
+pub type ViewportMap<T> = nohash_hasher::IntMap<ViewportId, T>;
+
 // ----------------------------------------------------------------------------
 
 /// This will deref to [`Self::this`].