There is currently no option to disable fancy portals.
There is currently no option to disable join/leave animations.
There is currently no option to disable items without being world host.
Having an option in safety settings would mitigate performance dips and be safer for users by giving users control of/ the ability to disable uncontrollable particles/ animations. For epileptic and photosensitive users, disabling items individually is tedious and problematic, some of us can not look at items to disable them without risking medical problems. The same can be said for fancy portals and join/ leave animations if people join/leave near you, we do not have control over placement.
Give us an option to disable these in the safety settings.