'''Show us something'''. Just saying there's an issue doesn't help us help you... What OS? What version of Firefox? If windows, post screenshot of the performance tab in task manager. You mention nothing about your system and the specs... Here's 4 and 8k with no stuttering issues. see screenshots https://www.youtube.com/watch?v=iinuZkBdW5U https://www.youtube.com/watch?v=qmN1Gf8rRc8 Operating System: openSUSE Leap 15.6 KDE Plasma Version: 5.27.11 KDE Frameworks Version: 5.115.0 Qt Version: 5.15.12 Kernel Version: 6.4.0-150600.23.25-default (64-bit) Graphics Platform: X11 Processors: 16 × AMD Ryzen 7 PRO 6850HS with Radeon Graphics Memory: 62.1 GiB of RAM Graphics Processor: AMD Radeon Graphics Manufacturer: HP Product Name: HP EliteBook 865 16 inch G9 Notebook PC