Why does my 4K timeline stutter in Premiere Pro 2026 despite a beefy PC?

That's a classic symptom of codec inefficiency, not your hardware. XAVC S-I is intraframe, but it's still heavily compressed 10-bit 4:2:2, which is tough on decoding. ProRes 422 HQ is better, but the real culprit might be that you're not using hardware decoding properly. In Premiere Pro 2026, there's a new preference under **Media > Hardware Decoding** that lets you force CUDA for all codecs. Make sure it's set to 'CUDA' not 'Auto' – sometimes it defaults to a less optimal path. Also, check if your sequence settings match your footage exactly (frame size, frame rate, etc.). Mismatches cause extra processing.

Another pro tip: create **proxy files** using the 'ProRes Proxy' preset (or 'H.264 Proxy' if you want smaller) – they're not just for editing, they also improve timeline smoothness dramatically. Generate them via the Project panel, and toggle proxies on/off with the 'Toggle Proxies' button. Finally, try setting your **Playback Resolution** to '1/8' during heavy scrubbing – in 2026, there's also a new 'Dynamic' mode that automatically adjusts resolution based on system load. Give that a shot!

Thanks editorwizard92! Forcing CUDA decoding and creating ProRes proxies made a night-and-day difference. I also switched the playback resolution to 'Dynamic' and now scrubbing is buttery smooth even at 4K. I never realized the hardware decoding setting was set to 'Auto' – that was the bottleneck. Appreciate the detailed help, you saved my deadline!