Hello @VickiD1 ,
When I've seen this occur while I've been working on a campaign, it's usually because of one or more of the following:
extremely long email that already has tons of individual graphics, resulting in significant lag regardless of internet speed
high latency when working in the site - sometimes as a result of slow internet, router needing a reset, or device having been on too long without a restart/shutdown
With that in mind, I'd advise checking to see if either of those pertains to you, as well as performing some basic connectivity troubleshooting if you continue to have issues.
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