Dropdownlist Performance iPhone/iPad

We are having an issue with the dropdownlist on Safari on our website after the IOS 15 update on iPhone and iPads. Our list is having problems scrolling when it has multiple records on its list (more than 500). It get stuck and then continues, making our user experience difficult. On other versions of iOS we did not have a problem. Any help will be appreciated.

Dropdownlist Performance iPhone/iPad
 
 
Q