Google Cloud published a piece for data engineers about the "noisy neighbour" problem: when lots of customers share one big processing pipeline, a single one having a bad day can back up the whole thing. Their fix is to split the work into separate lanes so a problem in one place stays in one place.
None of that is something you will ever configure. But the underlying idea is worth ten minutes of your attention, because most small business websites live in exactly the situation Google is describing.
If you are on shared hosting (many websites sitting on one server, splitting its memory and processing power between them), you have neighbours. You cannot see them and you did not choose them. When one of them gets a traffic spike, runs a badly built plugin, or gets attacked, your site can slow down or briefly stop responding. Nothing on your end has changed. You just live next door to the problem.
The symptoms are usually mistaken for something else. Pages that load fine at nine in the morning and crawl at two in the afternoon. A contact form that occasionally times out. An admin area that feels sluggish for an hour and then does not. If your developer has already checked your images, your plugins and your database and found nothing wrong, the cause may simply be who else is on the box.
The practical version of Google's "separate lanes" answer, at your scale, is isolation. That might mean a hosting plan where your resources are reserved for you rather than shared, or a managed host that actively polices what its other tenants can do. It costs more per month. Whether that is worth it depends entirely on whether your site is a brochure or the thing that takes bookings and payments.
What to do: nothing urgent. Next time you speak to whoever maintains your site, ask two questions. Are we on shared hosting, and if so, have we ever seen slowdowns that could not be traced back to our own site? If the answer to the second is yes, it is worth pricing a plan with reserved resources before your next busy season, not during it.
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