Why is simulation playback slow after updating to Cinema 4D 2025.3 (or later)?

With the release of Cinema 4D 2025.3, we've added Liquid simulations, and with that, we've added a "Liquid Collisions" setting in the Collider Tag.

By default, the mode is set to Volume since this will provide the most accurate collisions (see screenshot); however, this setting can potentially slow down simulation playback.

If you find playback to be sluggish, switch the Liquid Collision mode to Surface or Off.

If that does not help, please refer to the following article, as it will walk you through common troubleshooting steps you can take, as well as how to contact support if all else fails:
I'm having issues with Cinema 4D, what can I do?