recent switcher, I bought a Mac Pro M1 on November 11 and try one of my webgl prog that run fast in Safari. Some days later, Safari goes slow and I go back to others nav. I decided to wait next Mac OS release which happens for me yesterday December 12 : version 12.1 Monterey. Now safari is 15.2 and new tests show a disaster : A simple move on screen with P5.js of an obj model takes : 7,381s on Chrome, 7,447 s on Edge, 7,330 s on Brave and ... 32,598 s on Safari ! I supposed one day that can comes from external monitors ( I work on a high canvas ), but last tests were done with a reduced 800x800 canvas on computer screen . So wrong path. is this a known problem ? thanks