commit 98df232, Neomacs idle CPU is now about 0.6%–1%, but it’s still higher than Emacs’ idle 0% — almost invisible in top, but there’s room for improvement.

src/emacs -Q
2026-03-02T01:12:26.553607Z  INFO neomacs_display::ffi::threaded: neomacs_display_init_threaded: 960x640
2026-03-02T01:12:26.553692Z  INFO neomacs_display::ffi::threaded: Running render loop on main thread
2026-03-02T01:12:26.553716Z  INFO neomacs_display::render_thread: Render thread starting
2026-03-02T01:12:26.678459Z  INFO neomacs_display::render_thread: Display scale factor: 2
2026-03-02T01:12:26.678513Z  INFO neomacs_display::render_thread: Render thread: window created (physical 1920x1280)
2026-03-02T01:12:26.678516Z  INFO neomacs_display::render_thread: Initializing wgpu for render thread
2026-03-02T01:12:26.680031Z  INFO neomacs_display::render_thread: wgpu adapter: Intel(R) UHD Graphics 630 (vendor=0000, device=0000, backend=Metal)
2026-03-02T01:12:26.689367Z  INFO neomacs_display::backend::wgpu::image_cache: Starting 12 image decoder threads
2026-03-02T01:12:26.729852Z  WARN cosmic_text::font::system: failed to load font 'GB18030Bitmap'
2026-03-02T01:12:26.731403Z  WARN cosmic_text::font::system: failed to load font 'GB18030Bitmap'
2026-03-02T01:12:26.731435Z  INFO neomacs_display::render_thread: wgpu initialized: 1920x1280, format: Bgra8UnormSrgb
2026-03-02T01:12:26.746021Z  INFO neomacs_display::render_thread: WindowEvent::Resized: 1920x1280
2026-03-02T01:12:26.746137Z  INFO neomacs_display::render_thread: Sending WindowResize event to Emacs: 960x640 (logical)
2026-03-02T01:12:26.746163Z  INFO neomacs_display::render_thread: Scale factor changed: 2 -> 2
2026-03-02T01:12:26.746171Z  INFO neomacs_display::render_thread: WindowEvent::Resized: 1920x1280
2026-03-02T01:12:26.746233Z  INFO neomacs_display::render_thread: Sending WindowResize event to Emacs: 960x640 (logical)
2026-03-02T01:12:31.588854Z  INFO neomacs_display::ffi::scene: neomacs_display_resize: 960x640 -> 974x640
2026-03-02T01:12:31.588878Z  INFO neomacs_display::ffi::image: neomacs_display_clear_all_glyphs: clearing 0 glyphs
2026-03-02T01:12:31.590049Z  INFO neomacs_display::render_thread: WindowEvent::Resized: 1948x1280
2026-03-02T01:12:31.590154Z  INFO neomacs_display::render_thread: Sending WindowResize event to Emacs: 974x640 (logical)
2026-03-02T01:12:31.624554Z  INFO neomacs_display::layout::emacs_types: Window offsets: frame=8, next=16, contents=80
2026-03-02T01:12:31.624569Z  INFO neomacs_display::layout::emacs_types: Frame offsets: root_window=56, selected_window=64, minibuffer_window=80
2026-03-02T01:12:31.624572Z  INFO neomacs_display::layout::emacs_types: Emacs struct offsets validated successfully (lisp_fields=76)
2026-03-02T01:12:31.624579Z  INFO neomacs_display::ffi::layout: Rust layout engine initialized
2026-03-02T01:12:31.624586Z  INFO neomacs_display::layout::font_metrics: FontMetricsService: initializing cosmic-text FontSystem
2026-03-02T01:12:31.662631Z  WARN cosmic_text::font::system: failed to load font 'GB18030Bitmap'
2026-03-02T01:12:31.664311Z  WARN cosmic_text::font::system: failed to load font 'GB18030Bitmap'
2026-03-02T01:12:31.664334Z  INFO neomacs_display::layout::font_metrics: FontMetricsService: FontSystem ready
2026-03-02T01:12:31.675577Z  INFO neomacs_display::ffi::scene: neomacs_display_resize: 974x640 -> 960x640
2026-03-02T01:12:31.675594Z  INFO neomacs_display::ffi::scene: neomacs_display_resize: 960x640 -> 974x640
2026-03-02T01:12:31.675594Z  INFO neomacs_display::render_thread: New face_ids detected (old=0, new=3), clearing glyph cache
2026-03-02T01:12:31.685038Z  INFO neomacs_display::render_thread: New face_ids detected (old=3, new=4), clearing glyph cache

Originally posted by @georgealbert in #54