It ain't a bug - happens to me, too.
Unfortunately, that is a lot of info the computer has to process, and it slows down... if it stays slow, then it is a problem. If you gain momentum shortly thereafter, unfortunately, that is normal.
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Defender for the Light -
Goodness knows there is a lot of Dark out there!! - Where are my matches?
Wandering Joke of the Laughing Hyenas
Laughter can be a Mighty Weapon - when wielded with pizazz and accuracy! What Ho!!