Hi,

Has anyone had an issue with slow load on UI Extensions?

While the main HubSpot UI loads almost instantly, there is a noticeable delay when switching to the tab containing the UI extension. When the page loads in we see a loading spinner which then goes after several seconds.

We have contacted support about this and were sent a recording which didnt have this problem, so its very confusing.

Our extension includes some additional functionality—loading property values, dropdown options, and auto-populating associated objects—which can play a role in the delay. However, after testing with only the basic form (removing that extra logic), the load time seemed to remain the same.

From some investigating online, we’ve read it might be that HubSpot prioritizes the main UI and then loads custom extensions afterward. Is that correct? How can we fix this issue?

Thanks