Though I am not entirely sure, this could be a regression because if I am not mistaken this used not to be, or not as much.
Launch your browser and go to the Mapillary web app.
Place your browser window on one side of the screen and a CPU/process monitor on the other.
Notice how the CPU, and on multi‑core systems at least one core, goes full blast just to render the Mapillary page.
Generally speaking, at first glance, this does not seem to be an issue on desktop systems. But, it is indeed a huge issue on battery powered devices. Note that the Mapillary web app can be and usually is embedded into other apps, like the Mapillary mobile apps or OsmAnd. So, this is something that is going to drain mobile users’ batteries no matter what you do in the mobile app to save power. For testing, you can make this issue more pronounced when you switch to software rendering.
My humble guess is that the web app’s WebGL canvas just mindlessly renders in a loop instead of rendering only on updates, like input events or timed events. The Mapillary web app is not an action game, where input versus display latency may be of concern. However, power on battery powered devices is a huge concern and this is where the web app is often used.
Can you share the URL where you noticed this behaviour and the browser/OS? The CPU/RAM usage could rise when browsing images and zooming on the map in but should go down over time when the page is inactive and not loading anything new. Performance may differ depending on browser/OS.
I have observed this in Firefox 94 and 102.14.0esr, on x86_64, arm64, and armv7 CPUs, GNOME 42.9 (Wayland and X), and Android, including software and GPU rendering. I have not tested other browsers. GPU rendering causes less CPU load but still too much, especially when doing nothing (no user input and no page or data loading). This behavior does not depend on any particular image or map view. Simply viewing the initial world map at level 2 is enough to cause this issue. It also does not matter whether the view is filled with an image or the map only.
On Android, I can clearly see a significant increase in power use when the Mapillary WebView is visible (on the screen), both in the Mapillary mobile app as well as in OsmAnd. Android’s Settings app’s battery chart and developer options are very handy in diagnosing this. To make it perhaps more pronounced, you should be able switch to software rendering on Android (I am not sure if this is still possible on the latest Android versions). As expected, when the WebView becomes invisible, like switching to another Activity or app, power usage drops to close to zero.
The CPU/RAM usage could rise when browsing images and zooming on the map in but should go down over time when the page is inactive and not loading anything new.
Unfortunately, this is exactly what is not happening, even when doing nothing. For example, in GNOME just having the tab open on top in the browser but the browser in the background makes the CPU or a core go full blast. When I switch to another browser tab then processing of the Mapillary web app tab stops as expected. Basically the same happens on Android. Either way, doing nothing in the Mapillary web app should keep CPU load close to zero.
Thanks! We’ll start by updating to the latest version of MapLibre GL JS as we’ve been using a pretty old version on the Mapillary web app. Hopefully this resolves the issue.
With auto-advance activated (default settings), CPU load is growing up from 6% to 20% i.e. one virtual core is fully loaded.
What you are talking about is to be more or less expected by design. We are talking about the situation when the website is idling, no user input, no data loading, and no automatic (internal) website activity.
system ERROR in CurrentUserService.reloadCurrentUser() No accessToken and/or userId in local storage main.fa41a69103e1a85b.js:1:551355
WebGL warning: texImage: Alpha-premult and y-flip are deprecated for non-DOM-Element uploads.
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Image "wave-right" could not be loaded. Please make sure you have added the image with map.addImage() or a "sprite" property in your style. You can provide missing images by listening for the "styleimagemissing" map event. main.fa41a69103e1a85b.js:284:594852
Image "wave-left" could not be loaded. Please make sure you have added the image with map.addImage() or a "sprite" property in your style. You can provide missing images by listening for the "styleimagemissing" map event. main.fa41a69103e1a85b.js:284:594852
WebGL warning: texImage: Alpha-premult and y-flip are deprecated for non-DOM-Element uploads.
Image "park-small" could not be loaded. Please make sure you have added the image with map.addImage() or a "sprite" property in your style. You can provide missing images by listening for the "styleimagemissing" map event. main.fa41a69103e1a85b.js:284:594852
Image "none" could not be loaded. Please make sure you have added the image with map.addImage() or a "sprite" property in your style. You can provide missing images by listening for the "styleimagemissing" map event. main.fa41a69103e1a85b.js:284:594852
WebGL warning: texImage: Alpha-premult and y-flip are deprecated for non-DOM-Element uploads.
WebGL warning: texImage: Alpha-premult and y-flip are deprecated for non-DOM-Element uploads.
WebGL warning: texImage: Alpha-premult and y-flip are deprecated for non-DOM-Element uploads. 7
WebGL warning: texImage: Alpha-premult and y-flip are deprecated for non-DOM-Element uploads. 2
WebGL warning: texImage: Alpha-premult and y-flip are deprecated for non-DOM-Element uploads. 19
After reporting 32, no further warnings will be reported for this WebGL context.
Looks like this texImage WebGL warning could be the culprit because although it stops after 32 messages it continues to be a problem. Something tells me that texImage() is called way too often here.
Image "arrow-large" could not be loaded. Please make sure you have added the image with map.addImage() or a "sprite" property in your style. You can provide missing images by listening for the "styleimagemissing" map event. main.fa41a69103e1a85b.js:284:594852
Image "arrow-small" could not be loaded. Please make sure you have added the image with map.addImage() or a "sprite" property in your style. You can provide missing images by listening for the "styleimagemissing" map event. main.fa41a69103e1a85b.js:284:594852
Please also note the Image "" could not be loaded warnings. I am not sure where these might come about.
Thank you for investigating. However, I am afraid that things have not improved much. CPU load still hovers at 25% per core. In other words, while the Mapillary web app tab is active, everything continues to become quite sluggish.
I have also tested setting webgl.max-warnings-per-context to 0, just to rule out that processing the WebGL warning: texImage: … warning could be the culprit. As expected, WebGL stops producing warnings but CPU load does not improve.
Just let us know when you are ready, so that we can test again reliably.
at the console…
Something tells me that