In 2025 there is almost no reason to manually adjust all the speeds in your print profile. If you want to slow things down, go to your filament settings and under “Volumetric speed limitation” there’s a field for “Max volumetric speed”. If you reduce that, it will automatically “cap” your max speed. Each filament will have it’s own setting for “Max volumetric speed” so if some can print faster you won’t have to go muck around with all your print profile settings each time you switch filaments.

To compute the number based on the max speed you want to run, use this calculator: https://advanced3dprinting.com/pages/flow-rate-calculator. You can also run a volumetric flow calibration test (under the “calibration” menu) to figure out the highest flow your hotend can handle with a specific filament. Reduce that number by 20% for margin and you’ll have a speed limit that will give strong prints without slowing things down more than necessary.