@rdo118
Hi, thank you for the provided information. I had an idea of what the problem could be, and the first screenshot probably confirmed it - the readPixels function used within our forecast WebGL rendering pipeline. It is mandatory within our current pipeline, which was implemented many years ago based on WebGL1, and this approach was necessary and totally valid at that time. This function (gl.readPixels) can indeed be problematic; however, it is used with care and as little as possible. However, in case of using high-res screen(s), the performance could eventually degrade. To assure you, there were no changes in the pipeline in the last 3-4 years.

We are not going to do any modifications to the old pipeline since we are already working on a new one, which does not use any of these problematic functions at all. This will take some more time, so as a temporary solution, I can advise lowering your resolution (in case you are using multiple displays or e.g., a 4 K display) or setting browser zoom to e.g. 150-200% (in Firefox it is in the hamburger menu top-right).

Thank you for your patience.

Got the new test version today and it seems fine. The main map layers load quickly and almost perfectly smooth. It's really only the text layer (place names) that is a tiny bit slow, but that's not a real issue for me. Still much, much faster than before.

We are not going to do any modifications to the old pipeline since we are already working on a new one, which does not use any of these problematic functions at all. This will take some more time, so as a temporary solution, I can advise lowering your resolution (in case you are using multiple displays or e.g., a 4 K display) or setting browser zoom to e.g. 150-200% (in Firefox it is in the hamburger menu top-right).

Thank you for your patience.

This is all about loading stuff. When I zoom or pan or use the timeline scrub for forecasts, new tiles are being loaded, and that's where it all breaks down. It takes ages, and while the interface is waiting for the new tiles, everything is frozen. Just panning around very gently inside the tiny area where all the tiles have loaded already, is fine. No lag there.

I'm using Firefox, not Chrome. I did the equivalent thing in Firefox and there's nothing in the results any living being can make sense of. It's like a mega tetris with random colors. There are a few hundred different bits of code or procedure names plattered all over it, and that's simply impossible to compile into anything useful.

However, the latest update is about half as laggy as the current version at the time I created my first post. So something you've changed was in the right direction. It's still unbearably laggy, but there is a difference.

Here's the Firefox tetris:

And the equivalent in Chrome, quite possibly even worse than the Firefox one:

So first, I have a few more questions:

• Is the map laggy even when you are panning without loading new tiles - more specifically, whether the map seems smooth until new tiles are being loaded (lag spikes), or does it have bad frame times (bad fps) all the time?
• Does this also happen in radar and satellite overlays?

And second, could you make us favor and perform a little investigation within chrome devtools - in Performance tab? Simply load Windy, click Record button in the left corner and then perform some interaction with the map (interaction you reported to us as being laggy), let's say for 5-10 seconds. After stopping the recording, look for tasks that took too long and that eventually caused dropped frames. Among these tasks can be e.g. readPixels, texImage2d, texSubImage2d... And send us a screenshot of the flamegraph (including the frames row for context), ideally with a detailed view of the lag spike.

E.g. like this:

Here is a little guide on chrome flame graph. https://medium.com/slalom-blog/flame-graphs-in-chrome-devtools-a-guide-for-front-end-developers-b9503ff4a4d

Thank you for your patience and cooperation.

My question is, with your higher end computer...why did you need to use graphics compatibility at all? I don't have a dedicated GPU and Windy runs fine.

Seems to me, that when you noticed a problem in the past but it went away when you turned on that setting is the day something went funky with how your setup communicates with the instructions/operations that Windy uses.

But I'm just a user who shouldn't even have replied in the first place lol

I'm on a slightly older driver due to compatibility issues. Nvidia has had a long string of drivers that have messed up a few things, which has made me wary of updating. But drivers from the beginning of this year shouldn't be too old for a modern website. My mobile hasn't had an update of any kind in over a year, and it works fine there.

Well, it was a good run. Maybe time to find an alternative. I've enjoyed Windy, but it's unusable now, and I'm reading between the lines that this is how it is going forward.

Could you please try a different browser than Firefox? Ideally chrome-based. Thank you!

Alternatively, you could try updating your GPU drivers

Name 	Firefox
Version 	142.0
Build ID 	20250811145442
Distribution ID 	
Update Folder 	
C:\ProgramData\Mozilla-1de4eec8-1241-4177-a864-e594e8d1fb38\updates\CAD80AFE5C68F6E7
Update History 	
Update Channel 	release
User Agent 	Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:142.0) Gecko/20100101 Firefox/142.0
OS 	Windows_NT 10.0 19045
Application Binary 	C:\Program Files\[removed for privacy reasons]\firefox.exe
Profile Folder 	
[removed for privacy reasons]
Build Configuration 	about:buildconfig
Memory Use 	about:memory
Performance 	about:processes
Registered Service Workers 	about:serviceworkers
Third-party Modules 	about:third-party
Launcher Process 	Enabled
Multiprocess Windows 	1/1
Fission Windows 	1/1 Enabled by default
Remote Processes 	28
Enterprise Policies 	Active
Google Location Service Key 	Found
Google Safebrowsing Key 	Found
Mozilla Location Service Key 	Found
Safe Mode 	false
Memory Size (RAM) 	63,9 GB
Disk Space Available 	198 GB
Profiles 	about:profiles
Pointing Devices 	Mouse

about:support#graphics

The fish demo works perfectly fine. My display is limited to 60 Hz, so the demo can't go above that, but I get a steady and smooth 60 fps up to the 15 000 setting. 20 000 gets me 55-57 fps. 30 000 is in the high 30s fps.

Here's the dump:

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Font Visibility Debug Info	Windows Platform
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RAM	16376
GPU #2
Active	No
RAM	0
Diagnostics
AzureCanvasBackend	skia
AzureCanvasBackend (UI Process)	skia
AzureContentBackend	skia
AzureContentBackend (UI Process)	skia
AzureFallbackCanvasBackend (UI Process)	skia
CMSOutputProfile	[removed because it was insanely long]
Display0	3840x2160@60Hz scales:1.000000|1.250000
Display1	2560x1440@60Hz scales:1.000000|1.000000
DisplayCount	2
HardwareStretching	both=1 window-only=0 full-screen-only=1 none=0 error=0
GPUProcessPid	43356
ClearType Parameters	\\.\DISPLAY1 [ Gamma: 1.8 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50 ] \\.\DISPLAY2 [ Gamma: 1.8 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50 ] 
Font Visibility Debug Info	Windows Platform
Decision Log
HW_COMPOSITING	
default	available		
user	force_enabled	Force-enabled by pref	
D3D11_COMPOSITING	
default	available		
DIRECT2D	
default	disabled	Disabled by default	Blocklisted; failure code FEATURE_FAILURE_DISABLED
D3D11_HW_ANGLE	
default	available		
GPU_PROCESS	
default	available		
user	force_enabled	User force-enabled via pref	
WEBRENDER	
default	available		
WEBRENDER_COMPOSITOR	
default	available		
runtime	unavailable	No DirectComposition usage	Blocklisted; failure code FEATURE_FAILURE_DCOMP_PREF_DISABLED
WEBRENDER_PARTIAL	
default	available		
WEBRENDER_SHADER_CACHE	
default	available		
WEBRENDER_OPTIMIZED_SHADERS	
default	available		
WEBRENDER_ANGLE	
default	available		
WEBRENDER_DCOMP_PRESENT	
default	available		
user	disabled	User disabled via pref	Blocklisted; failure code FEATURE_FAILURE_DCOMP_PREF_DISABLED
WEBRENDER_SCISSORED_CACHE_CLEARS	
default	available		
WEBGPU	
default	available		
WINDOW_OCCLUSION	
default	available		
HARDWARE_VIDEO_DECODING	
default	available		
HARDWARE_VIDEO_ENCODING	
default	available		
HW_DECODED_VIDEO_ZERO_COPY	
default	available		
VP8_HW_DECODE	
default	available		
VP9_HW_DECODE	
default	available		
REUSE_DECODER_DEVICE	
default	available		
BACKDROP_FILTER	
default	available		
CANVAS_RENDERER_THREAD	
default	available		
ACCELERATED_CANVAS2D	
default	available		
AV1_HW_DECODE	
default	available		
REMOTE_CANVAS	
default	available		
runtime	blocked	Disabled without Direct2D	Blocklisted; failure code FEATURE_REMOTE_CANVAS_NO_DIRECT2D
VP8_HW_ENCODE	
default	available		
VP9_HW_ENCODE	
default	available		
AV1_HW_ENCODE	
default	available		
WMF_HW_DRM	
default	available		
GL_NORM16_TEXTURES	
default	available		
Failure Log
(#0) 	CP+[GFX1-]: Managed to allocate after flush.
(#1) 	CP+[GFX1-]: Managed to allocate after flush.

However, we would like to dig into the issue and try to solve it or find its source, and ideally help you. For that, we need additional information about your device, without which there is not much we can do. So, if you mind, would you try the following steps and report to us?

• Check that graphics acceleration is enabled in your system (if disabled, it might be emulated by your CPU, which might cause the problems)
• Check that you are not running power-saving mode
• GPU dump
  • go to chrome://gpu/ in chrome
  • or go to about:support#graphics in firefox
  • just paste the link into your browser and send us the report in the response
• Browser dump
  • go to chrome://version/ and send us google chrome version, user agent, os in the response
• Try some webgl sample/benchmark and check, whether the performance issues persist
  • e.g. https://webglsamples.org/aquarium/aquarium.html
  • or at least https://get.webgl.org/

The issue seems very suspicious since Windy behaves relatively smoothly even on low-end and old devices...