Big WebGL plotting speed regression

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f
f 2025-12-10，14:13
回答： Star Strider 2025-12-10，21:40
With the new WebGL versions (R2025a, R2025b), I am experiencing a major regression when plotting a large graph.
>> G
G =
graph with properties:
Edges: [1223248×19 table]
Nodes: [1150138×3 table]
>> plot(G, "EdgeCData", rescale, "XData", G.Nodes.x, "YData", G.Nodes.y, 'Marker', 'none');
On R2024b, this takes a few seconds to produce a usable and zoomable image.
>> opengl info
Warning: The opengl function will be removed in a future release. Use the rendererinfo function instead.
Version: '2.1 Mesa 17.1.3'
Vendor: 'Brian Paul'
Renderer: 'Mesa X11'
MaxTextureSize: 16384
Visual: 'Visual 0x9a, (RGBA 32 bits (8 8 8 8), Z depth 16 bits, Hardware acceleration, Double buffer, Antialias 0 samples)'
Software: 'true'
HardwareSupportLevel: 'none (known graphics driver issues)'
SupportsGraphicsSmoothing: 0
SupportsDepthPeelTransparency: 1
SupportsAlignVertexCenters: 0
Extensions: {152×1 cell}
MaxFrameBufferSize: 16384
On R2025b, the same command slows Matlab down to a hang, with the CPU stuck over 200%.
>> rendererinfo
ans =
struct with fields:
GraphicsRenderer: 'WebGL'
Vendor: 'Google Inc. (Google)'
Version: 'WebGL 2.0 (OpenGL ES 3.0 Chromium)'
RendererDevice: 'ANGLE (Google, Vulkan 1.3.0 (SwiftShader Device (Subzero) (0x0000C0DE)), SwiftShader driver)'
Details: [1×1 struct]
My system is a i5-1135G7 with 16GB RAM and Intel IRIS Xe Graphics (TigerLake-LP GT2), running Ubuntu 24.04.3.
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f
f 2025-12-10，18:40
编辑：f 2025-12-10，18:41
I can reproduce the bug with any large graph, for instance
rng(0); G = graph(sprandsym(1e5, 1e-4)); plot(G)
dpb
dpb 2025-12-10，21:12
Wonder if it would reveal anything to try to time a series of increasing sized graph plots to see if there is a breaking point or if it just scales?
My opinion would be it's worthy of an official support request; if specific issues aren't reported officially, Mathworks will have no knowledge of such issues as are arising with the new engine.

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回答（1 个）

Star Strider
Star Strider 2025-12-10，21:40
When I ran:
rng(0); G = graph(sprandsym(1e5, 1e-4)); plot(G)
on my desktop (AMD Ryzen Threadripper PRO 7955WX 16-Cores, NVIDIA TU117GL [T1000 8GB]) systmem, that entire code required about 7 seconds including rendering, with tic toc giving a 2 seconds execution. No warnings.
My laptop (AMD Ryzen 9 PRO w/ Radeon 780M Graphics) gsve about the same results (7 seconds and 2 seconds), however MATLAB displayed: 'Warning: Hardware-accelerated graphics is unavailable. Displaying fewer markers to preserve interactivity.'
You might also run your test code in MATLAB Online. It should give the same results I got here.
I had a similar problem earlier this year that was magically solved with an Ubuntu update while MathWorks was working with me to solve it. The os-release information I can get only tells me that I have 24.04.3 and not any of the subsequent updates. I suggest that if you have not already done so, complttely update Ubuntu. The 'Software Updater' funciton should do this for you automatically when you invoke it.
.

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