Hi Alex
Thank you for your detailed review on the new V12!
Please compare the same project on the old V11.
Also check the Main menu > Settings > Preferences. Timeline tab. Are you using "Auto scroll - Style 1" or "Style 2"?
"Style 2" mode puts more stress on the graphics due to continuous scrolling and the cursor being centered.
LumenLux,
Thanks for your comment, glad to see you again!