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I have 7.5.4 site running in Azure. The overall performance is good, but the preview is really slow. Around 1 min. everytime.
When I check the console for preview page, I can see that 2 calls are slow:
1: /umbraco/ServerVariables <-- takes 30sec. It only outputs a small amount of json. This call is called everytime the Preview button clicked, and it takes 30 sec everytime.
2: /11501.aspx <-- also takes around 30 sec. This is the actual page to preview. But the published page takes < 200ms to load on the site.
On my local dev machine, these 2 calls are < 100ms to load.. ServerVariables are even 20ms only.
In Azure, I checked that both DTU and CPU are not 100% when calling Preview. The log is also clear for any errors..
Anyone has any idea to this load problem?
I have the exact same issue on a non Azure site. If anyone is familiar with this problem and has a fix, I'd love to hear it!
Server: Windows Server 2012 R2
I'm also experiencing a slow preview. The site is also hosted in Azure. Takes around 30 seconds before it displays a preview and sometimes it crashes due to time out. Does anyone know anything more about the issue?
It's been a year since I posted this.. but I recall I did some fixing myself.
I think I updated the preview.htm/.js files, and removed "/umbraco/ServerVariables" call, and instead of the call just returned some json. Apparently it's always the same json from ServerVariables endpoint. I properly also did some other caching stuff to get this to work.
Unfortunately this is the only way to fix this.
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