Same issue here.... After Big Sur update the machine is extremely slow on performing basic tasks, such as log into profile, change profiles, and anything which uses graphic card, such as simple gaming in windowed mode and low res, which with Catalina did not happen at all. Noticed some screen "blanking" on loading from boot: The load screen background and the screen itself go black and then reappear. Noticed on switch between existing users, that the computer displays the load icon on the mouse for a few second after showing the new login screen for the user, and after it disappears it takes up to 5 seconds before you are allowed to write the password on the field, almost a "mini lockup" or lagging. Opening files via Browser such as Safari takes much longer than usual, also data download start seems slower even for small files such as a PDF of 238Kb. Even text scrolling via cursor keys is slower. Machine Specifications: MacBook Pro (Retina, 15-inch, Mid 2015) CPU: 2,5 GHz Quad-Core Intel Core i7 RAM: 16 GB 1600 MHz DDR3 GRAPHICS: Intel Iris Pro 1536 MB HDD: APPEL SSD SM0512G (free space in HDD 353 GB) - APFS file system Is there a chance to roll back to Catalina? Big Sur is definitely so very disappointing that I wish I hadn't updated until it was stable enough. Never had any latency or lag issues with Catalina, or Mojave for instance...

Same issue here.... After Big Sur update the machine is extremely slow on performing basic tasks, such as log into profile, change profiles, and anything which uses graphic card, such as simple gaming in windowed mode and low res, which with Catalina did not happen at all. Noticed some screen "blanking" on loading from boot: The load screen background and the screen itself go black and then reappear. Noticed on switch between existing users, that the computer displays the load icon on the mouse for a few second after showing the new login screen for the user, and after it disappears it takes up to 5 seconds before you are allowed to write the password on the field, almost a "mini lockup" or lagging. Opening files via Browser such as Safari takes much longer than usual, also data download start seems slower even for small files such as a PDF of 238Kb. Even text scrolling via cursor keys is slower. Machine Specifications: MacBook Pro (Retina, 15-inch, Mid 2015) CPU: 2,5 GHz Quad-Core Intel Core i7 RAM: 16 GB 1600 MHz DDR3 GRAPHICS: Intel Iris Pro 1536 MB HDD: APPEL SSD SM0512G (free space in HDD 353 GB) - APFS file system Is there a chance to roll back to Catalina? Big Sur is definitely so very disappointing that I wish I hadn't updated until it was stable enough. Never had any latency or lag issues with Catalina, or Mojave for instance...