Cold starts after upgrading to Umbraco 17

[lassespilling (Lasse Dollis Spilling)]

Hi, i recently upgraded from Umbraco 13 to Umbraco 17.

I have been experiencing “cold boots” all of a sudden,
if i don’t visit the frontend in a few hours it takes a long time to “start” the website then it is quick again.

I am using delivery api, headless with an Astro SSR frontend. Same setup as on multiple other sites, except this one is Umbraco 17.

Is there anything new in Umbraco 17 that could cause this?

E.g. something to do with Runtime mode, modelsbuilder or something?

Thanks.

[EssCee (SC)]

If you’re on Azure App Service, I would check:

Always On : Enabled

Ensure the plan is not Free or Shared.

Check if the app is restarting due to memory pressure?

[lassespilling (Lasse Dollis Spilling)]

It is on a VPS server with multiple other Umbraco sites.
All the other run on Umbraco 13.

None of them have this issue.

[cheeseytoastie (Steve Morgan)]

Weirdly was just reading the release notes on 17.0.2 and there’s this:

Sync: Fix SyncBootStateAccessor to use ILastSyncedManager to prevent unnecessary cold boots

[lassespilling (Lasse Dollis Spilling)]

@cheeseytoastie

17.0.2

Interesting, i will update and test.