Hello Steve, Thank You for your inquiry.
As per the additional details you provided via the support case, the iphone 6 would not be able to properly process the Cenario.
We recommend at a minimum the iphone 7. Your title was tested using an iphone8 and ran smoothly between scenes.
CenarioVR supports running in website format, however, the best viewing and functionality is available when using the CenarioVR mobile app. App is available in Apple’s App Store (https://apps.apple.com/us/app/cenariovr/id1298645282) and Google Play store (https://play.google.com/store/apps/details?id=com.trivantis.iris&hl=en_US).
For users to best view the content via mobile, (assuming in private based on the content) Within CenarioVR users would need to be added, their accounts created, then have the Cenario assigned to those users.
We provide a guideline in regards to compression below,
We will also follow up to your support case as we work with you,
Trivantis Customer Solutions