Newer versions of Final Cut Pro (10.6 and beyond) are heavily optimized for Apple Silicon (M1, M2, M3, M4 chips). On older Intel-based Macs (MacBook Pro 2015–2019), newer versions can feel sluggish. Version 10.4.6 is the "Goldilocks" update for Intel machines—modern enough to support 4K workflows, but light enough to run smoothly on a dual-core i5 or quad-core i7.
Resolving intermittent issues when uploading videos directly to YouTube. Key Features of the Final Cut Pro 10.4.x Architecture final cut pro 10.4.6 dmg