AllskyTeam
[BUG] Delay before "Loading" image goes away when accessing website via tablet/smartphone
Camera model
Raspi HQ
Operating System
Buster
Allsky version
V2023.05.01_05
Pi and amount of memory (512 MB, 1, 2, 4, or 8 GB)
Raspi 4, 8GB
Bug Description
When I go to my AllSky website via browser on my tablet (iPad 10) or my smartphone (Samsung Galaxy S23), the page regularly says "Loading" for about 60 seconds, apparently until the page automatically refreshes. When I do a manual reload, the camera image appears immediately. It works perfectly on a desktop computer: the camera image is always displayed immediately. It only happens with mobile devices.
Log / configuration files
No response
Is your Website on the Pi or a remote server on the Internet? If the later, what's the URL?
Since the delay only occurs with a mobile device, it's probably not a Allsky problem. What mobile browser are you using?
The website is on a remote webserver on the internet. The URL is:
https://sternstunden-astronomie.de/
I am using Chrome browser on my Android device and Safari on the ipad. The problem only occurs with my allsky website.
A friend of mine is hosting his allsky website on an internet server too and the same problem occurs with his allsky website, when I open it with my mobile devices, so I think its not a specific problem of my installation/webserver.
@markusd112, when I went to your page with my Samsung S10 using Samsung's browser, I saw "Loading" for 30-60 seconds (didn't time it). When I refreshed the page several times "Loading" was only there for 6 seconds. It's possible that's because I am in the US, but I haven't seen this behavior with other European Allsky sites. They usually show the picture as it downloads, but your whole image appeared at once. Your "intervalSeconds" is 30, so if you initially don't see the image for 60 seconds it probably isn't related to that. But as a test, would you please change the interval to 15 seconds and retest? I will also then retest.
Samsung's browser used to have Developer Mode, equivalent to F12 on a PC, but I can't find it anymore. Does the iPad have it?
@EricClaeys I've changed the interval to 15 seconds in the moment. Thanks for testing it.
edit: it seems that it decreases the time where you see "loading" to around 15 seconds for my Samsung Galaxy S23 now. But the strange thing is that it only happens with my S23 and my ipad as well, not with my computers (Firefox, Edge)...
On the ipad you can activate dev tools as described here, but it seems that you need a connection to a PC to access the web developer toolbar
https://stackoverflow.com/questions/5734323/ipad-safari-development-toolbar
With intervalSeconds at 15 the image showed up in about 3 -4 seconds. Try the default of 5 seconds.
I looked at the code for the page and can't see why there would be a delay, other than typical network speed. That's not saying there isn't a problem, just that I can't see one.
@Alex-developer, thoughts?
Which address are you having a problem with? The screenshot shows one address, partly obscured but you posted another one in the comment above.
If its a local website i.e. a .local address I can probably explain it but if its an externally hosted site then I would have to do some testing
Thanks
Alex
@Alex-developer It is a public hosted website. I have assigned a temporarily Domainname and wiped out the normally used one, because I don‘t want to publish it here. The problem occurs with both DNS names. It also occurs at the public allsky website of a friend of mine (other hosting provider than me: IONOS), so it doesn‘t seems to be a specific problem with my installation or my hosting provider ( all-inkl.com)
@Alex-developer It is a public hosted website. I have assigned a temporarily Domainname and wiped out the normally used one, because I don‘t want to publish it here. The problem occurs with both DNS names. It also occurs at the public allsky website of a friend of mine (other hosting provider than me: IONOS), so it doesn‘t seems to be a specific problem with my installation or my hosting provider ( all-inkl.com)
Thanks
We will take a look and see if we can reproduce it
Alex
With intervalSeconds at 15 the image showed up in about 3 -4 seconds. Try the default of 5 seconds.
I have set it to 5 seconds today and it needs around 3-5 seconds now to display the allsky image on the mobile devices.
I followed the recommendation in the documentation and set it to half the exposure time (30 seconds). So setting it to 5 seconds seems to be a good way getting it working, still the cause for this issue is unclear. I believe that the computing power of end devices is so great these days that this shouldn't have a massive impact on CPU usage.