Hi Rayos,
Thank you for bringing this question to our attention.
Based on the limited information that you have sent. Is it possible for an older phone fps to drop when ads are bing served? Yes it is possible, without knowing how old the phone is, the OS and many other factors that would go in to why a phone slows down. But it is possible. As the older phones are not using the current processor or OS might be vastly outdated.
There are many factors that could add up to a slower experience, even if it is just a banner ad.
Regards,
William Pescherine
Mobile Ads SDK Team
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