diff --git a/ports/servoshell/desktop/app_state.rs b/ports/servoshell/desktop/app_state.rs
index cabc02a9f5e..b965dadfa30 100644
--- a/ports/servoshell/desktop/app_state.rs
+++ b/ports/servoshell/desktop/app_state.rs
@@ -29,7 +29,7 @@ use super::app::PumpResult;
 use super::dialog::Dialog;
 use super::gamepad::GamepadSupport;
 use super::keyutils::CMD_OR_CONTROL;
-use super::window_trait::{LINE_HEIGHT, WindowPortsMethods};
+use super::window_trait::{LINE_HEIGHT, LINE_WIDTH, WindowPortsMethods};
 use crate::output_image::save_output_image_if_necessary;
 use crate::prefs::ServoShellPreferences;
 
@@ -425,19 +425,19 @@ impl RunningAppState {
                 webview.notify_scroll_event(ScrollLocation::End, origin);
             })
             .shortcut(Modifiers::empty(), Key::ArrowUp, || {
-                let location = ScrollLocation::Delta(Vector2D::new(0.0, -3.0 * LINE_HEIGHT));
+                let location = ScrollLocation::Delta(Vector2D::new(0.0, -1.0 * LINE_HEIGHT));
                 webview.notify_scroll_event(location, origin);
             })
             .shortcut(Modifiers::empty(), Key::ArrowDown, || {
-                let location = ScrollLocation::Delta(Vector2D::new(0.0, 3.0 * LINE_HEIGHT));
+                let location = ScrollLocation::Delta(Vector2D::new(0.0, 1.0 * LINE_HEIGHT));
                 webview.notify_scroll_event(location, origin);
             })
             .shortcut(Modifiers::empty(), Key::ArrowLeft, || {
-                let location = ScrollLocation::Delta(Vector2D::new(-LINE_HEIGHT, 0.0));
+                let location = ScrollLocation::Delta(Vector2D::new(-LINE_WIDTH, 0.0));
                 webview.notify_scroll_event(location, origin);
             })
             .shortcut(Modifiers::empty(), Key::ArrowRight, || {
-                let location = ScrollLocation::Delta(Vector2D::new(LINE_HEIGHT, 0.0));
+                let location = ScrollLocation::Delta(Vector2D::new(LINE_WIDTH, 0.0));
                 webview.notify_scroll_event(location, origin);
             });
     }
diff --git a/ports/servoshell/desktop/headed_window.rs b/ports/servoshell/desktop/headed_window.rs
index ac55a9eea84..5e3dc8d9bf1 100644
--- a/ports/servoshell/desktop/headed_window.rs
+++ b/ports/servoshell/desktop/headed_window.rs
@@ -48,7 +48,7 @@ use {
 use super::app_state::RunningAppState;
 use super::geometry::{winit_position_to_euclid_point, winit_size_to_euclid_size};
 use super::keyutils::{CMD_OR_ALT, keyboard_event_from_winit};
-use super::window_trait::{LINE_HEIGHT, WindowPortsMethods};
+use super::window_trait::{LINE_HEIGHT, LINE_WIDTH, PIXEL_DELTA_FACTOR, WindowPortsMethods};
 use crate::desktop::accelerated_gl_media::setup_gl_accelerated_media;
 use crate::desktop::keyutils::CMD_OR_CONTROL;
 use crate::prefs::ServoShellPreferences;
@@ -621,13 +621,19 @@ impl WindowPortsMethods for Window {
             },
             WindowEvent::MouseWheel { delta, .. } => {
                 let (mut dx, mut dy, mode) = match delta {
-                    MouseScrollDelta::LineDelta(dx, dy) => {
-                        (dx as f64, (dy * LINE_HEIGHT) as f64, WheelMode::DeltaLine)
-                    },
+                    MouseScrollDelta::LineDelta(dx, dy) => (
+                        (dx * LINE_WIDTH) as f64,
+                        (dy * LINE_HEIGHT) as f64,
+                        WheelMode::DeltaLine,
+                    ),
                     MouseScrollDelta::PixelDelta(position) => {
-                        let scale_factor = self.device_hidpi_scale_factor().inverse().get() as f64;
-                        let position = position.to_logical(scale_factor);
-                        (position.x, position.y, WheelMode::DeltaPixel)
+                        let position: LogicalPosition<f64> =
+                            position.to_logical(self.device_hidpi_scale_factor().get() as f64);
+                        (
+                            position.x * PIXEL_DELTA_FACTOR,
+                            position.y * PIXEL_DELTA_FACTOR,
+                            WheelMode::DeltaPixel,
+                        )
                     },
                 };
 
diff --git a/ports/servoshell/desktop/window_trait.rs b/ports/servoshell/desktop/window_trait.rs
index 62e81b1ee73..14684ec084b 100644
--- a/ports/servoshell/desktop/window_trait.rs
+++ b/ports/servoshell/desktop/window_trait.rs
@@ -15,7 +15,12 @@ use servo::{Cursor, RenderingContext, ScreenGeometry, WebView};
 use super::app_state::RunningAppState;
 
 // This should vary by zoom level and maybe actual text size (focused or under cursor)
-pub const LINE_HEIGHT: f32 = 38.0;
+pub const LINE_HEIGHT: f32 = 76.0;
+pub const LINE_WIDTH: f32 = 76.0;
+// MouseScrollDelta::PixelDelta is default for MacOS, which is high precision and very slow
+// in winit. Therefore we use a factor of 4.0 to make it more usable.
+// See https://github.com/servo/servo/pull/34063#discussion_r2197729507
+pub const PIXEL_DELTA_FACTOR: f64 = 4.0;
 
 pub trait WindowPortsMethods {
     fn id(&self) -> winit::window::WindowId;