The hidden speed killers slowing down your hubspot site (and how to fix them)

You launch a new page on HubSpot. Everything looks perfect. But then—ouch—PageSpeed Insights flags your hero image as the culprit, your Core Web Vitals are shaky, and mobile users are bouncing before your content even loads.

Even on HubSpot, a platform that does a lot of heavy lifting for you, speed isn’t automatic. The real culprits? Heavy images, oversized media, and sneaky modules that pile on extra scripts. The good news: you can fix them without installing a single plugin. Here’s how.

Start with hubspot’s hidden superpowers

HubSpot isn’t just a CMS—it’s a speed machine… if you know how to use it. Images are automatically compressed and served in responsive sizes for mobile and desktop. Modern formats like WebP? HubSpot handles that too.

But don’t get lazy. Specify exact widths and heights when inserting images. Oversized files are one of the most common reasons LCP (Largest Contentful Paint) suffers. Even a single bloated hero image can tank your score.

Optimise before you upload

Think of it like prepping ingredients before cooking. HubSpot can’t work miracles if you throw in a giant raw file.

• Compress images with TinyPNG, TinyJPG, Squoosh, or ImageOptim.

• Resize to the exact dimensions your page actually needs.

Lean, properly sized images make pages feel instant—especially on mobile.

Let lazy loading do the heavy lifting

HubSpot automatically lazy loads images below the fold, which speeds up initial rendering. For custom modules, add loading="lazy" so images only load when they come into view. This simple trick improves LCP and reduces unnecessary network requests.

Tame video and other media

Videos are the silent killers of page speed. Hosting them directly on HubSpot? Usually a bad idea. Use YouTube, Vimeo, or Wistia embeds instead.

Background videos? Keep them short, compressed, and provide a fallback image for mobile. These tweaks alone can drastically improve mobile performance.

Trust the CDN, but clean house

HubSpot’s global CDN delivers your images and assets fast. No caching plugins needed.

What you do need to watch: bloated page builder modules or unused scripts. Stick to lightweight, native modules and prune anything unnecessary. It’s amazing how much faster a page feels when you declutter the backend.

The verdict

Even on HubSpot, speed requires intention. Pre-optimize images, use HubSpot’s tools wisely, and keep modules lean. Your Core Web Vitals—and your users—will thank you.

Pro tip: Run every new page through PageSpeed Insights or Lighthouse. Often, just a single unoptimized hero image is all that’s holding you back.