Some of the built-in effects are now realtime capable (Bass & Treble, Distortion, Phaser, Reverb and Wahwah).
#4352 Added a new effect: Shelf Filter.
Added an initial (beta) version of Beats and Measures.
#4414 Reworked the bottom toolbar dock:
    Project Sample Rate is now found in Audio Setup -> Audio Settings (formerly known as Project Rate).
    The Snapping Toolbar (formerly known as Snap-To) is now independent of the Selection Toolbar.
    Added a new Time Signature Toolbar (beta). It is hidden by default.
#4212 Improved Zooming behavior slightly (more to come in the future).
#4393 Added a new ruler, Linear (dB). This ruler goes from 0 dBFS to -∞ dBFS and better reflects the volume as shown in the recording/playback meters.
#3820 When copying clips between projects, you now can choose between whether to copy smart clips or just the visible portion.
#4133 Added a delete button to the Cut/Copy/Paste toolbar.

#1584 Audacity no longer dithers tracks unnecessarily.
#2427 Linux playback now handles output latency better (less stutters).
#3796 The EQ effect no longer resets clip names.
#3801 Audacity no longer crashes when trying to load projects with plugins that since have been deleted.
#4417 Resampling a track no longer trims it.

FFmpeg 6 (avformat 60) is now supported.
Moved from Breakpad to Crashpad.
Extracted various libraries from within Audacity.