Hello @TuChamber ,
Are you aware of any security programs like pop-up / ad blocker extensions, VPNs, or other security software the contact may be using that'd be struggling with the basic open/click tracking of our emails? If they do have any, are they able to safelist our domains in the particular program to alleviate the issue on their end?
It could also potentially be an issue of device age, but that'd not a particularly quick and easy fix. It may be worth having them see if the issue also occurs on other devices / email programs and apps they have access to. Beyond that, there's not much else on our end that we'd have for insight on this since opening a simple email shouldn't be causing any devices to lag to the extreme they mention.
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