Patch Rendering Performance R2025a vs R2021b

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Alexander Jöhl
Alexander Jöhl 2025-6-14
回答： Meet 2025-6-17
I use patch() often for simple realtime visualization of robots in our machines.
Until now we have worked with Matlab R2021b. I am looking at Matlab R2025a for evaluation.
The newer release seems to be slower at rendering patches than the older release. I made a simple script to test this, see below.
On my computer, the script has the following running time:
R2021b: 5.1 seconds
R2025a: 7.1 seconds
Why is the newer version slower? Do I need to handle patch() differently for better performance? Any suggestions?
close all
p = patch('XData', rand(100,1),'YData',rand(100,1),'ZData',rand(100,1));
view(3)
tic()
for idx = 1:100
p.XData = rand(100,1);
p.YData = rand(100,1);
p.ZData = rand(100,1);
drawnow();
end
toc()
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Walter Roberson
Walter Roberson 2025-6-17
I had the hypothesis that perhaps rand() was slower, so I tried preallocating XD = rand(100,100); and likewise YD and ZD, and then P.XData = rand(:,idx); and similar. The resulting code ran a bit slower on R2025a.
Alexander Jöhl
Alexander Jöhl 2025-6-17
I assumed that rand() timing is negligible, because I ran the code above but with drawnow() commented out and it took about 0.01 seconds.

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采纳的回答

Meet
Meet 2025-6-17
Hi Alexander,
I tested the code in both MATLAB R2025a and R2021b. The R2025a version was about 2 seconds slower than R2021b. However, when I ran the code with the "drawnow" command commented out, both versions took roughly the same amount of time. I believe the slower rendering of "patch()" in MATLAB R2025a compared to R2021b is mainly due to a significant change in the graphics rendering system introduced in R2025a. Specifically, MATLAB shifted from its previous Java-based graphics engine to a new WebGL-based system.
For more information on the new graphics rendering system refer the following MathWorks blog: https://blogs.mathworks.com/graphics-and-apps/2025/06/10/introducing-the-new-graphics-and-app-building-system-in-matlab-r2025a/
I would also recommend reaching out to MathWorks Technical Support regarding this query:
https://www.mathworks.com/support/contact_us.html
Hope this helps!!

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