The Super Metroid romhacks page https://www.speedrun.com/supermetroidhacks has had the "Oops! The site's under a lot of pressure right now" message for a few days now.

This message is pretty common to see on the site from time to time, but it has persisted on the SM romhack page while other pages have been fine.

Can something be done about this? We have it set up so that each romhack gets a category, and any%/100%/etc. are subcategories. More romhacks are added as more people do runs for new releases. It's a conglomerate page similar to how some games have very large extension category pages. Is the number of categories on the page an issue?

You can send a ticket to the support hub. After you send the ticket to support hub, what you can do is to hope that site moderators will handle the issue or respond to your ticket.