Apple Mail hiccuping or on hold?

Hello All: I bought a new imac and using Mojave. I am just wondering if any of you experience Apple Mail not budging for a few seconds (on hold not able to do anything in Mail).

Wondering if you can shed some light on this issue. It will happen when I select multiple emails.

Thank you

This happens to me occasionally, also running Mojave No idea why but my iMac has sevreral bugs I suspect

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My Mac is new and really is clean. Also my iMac w/el capitan does this “hiccup” too! I thought it was because it’s an older Mac.
Wonder how many use another mail client??

I just bought a 2017 iMac. It exhibits the same behavior. I do not see how I can run any diagnostics but am willing to try if some one has a suggestion.