Edit: the parent has edited their comment several times, which is fine since I invited them to, but the edits obscure the original comment, which was "I gave it a try and my first search got one match, 14 misses, and all other results are "Verifying..." but it seems stuck (it's been minutes). I can see why you cut your demo.".
It's marginally better because it explains what you mean, and that at least eliminates other nasty interpretations.
However, I don't think it's fair for you to assume they're "trying to hide that it's so slow". There's no need to impute bad motives to people, and you don't have nearly enough information to justify such a claim.
What's wrong with simply reporting the problem that you're experiencing with the software? That would make your comment helpful, with no trace of a putdown.
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> I can see why you cut your demo.
Can you please edit out swipes, as the site guidelines request (https://news.ycombinator.com/newsguidelines.html)? Your comment would be just fine without that bit.
Everyone is familiar with how often software launches run into glitches, and there's no need to be uncharitable.
(If you didn't mean it as a swipe and I just misread you, feel free to edit your comment and I'll delete this when I'm back online.)