Opengl software - Matlab becomes extremely slow

I'm operating on larger datasets and for this reason, I'm using Matlab on a Windows server which I acess via a remote desktop connection. From time to time I want to plot a scatter plot. When I do this for the first time, Matlab comes up with some warning message:

"MATLAB has disabled some advanced graphics rendering features by switching to software OpenGL."

The plots are generated, however, after this Matlab becomes extremely slow and more or less impossible to use. "Slow" means that it takes more than 1 minute to provide the result if you type "1+1" in the command line.

I don't know a lot about these servers where the program runs and their graphics hardware. Is there any way to avoid this and still get the plots? I don't mind if the plotting process itself takes 1 min or so. The plots themself don't contain too much of data (around 1000 colorpoints I'd asume).

Closing the plots or deleting the workspace ("clear all") don't help. The only way to speed Matlab up is to restart the program. I'm using Matlab 2020a.

[Nikhil Sapre]

Hi J B,

A possible reason MATLAB is using software OpenGL is because there is no harware graphics available on your machine. But, MATLAB shouldn't be very slow after generating the plots.

Is it possible for you to provide snippet of your code so I can verify this problem. Also output of the commands below

opengl info

[Natasha Kovacevic]

Hi I also have the same issue. Lagging from a single click to execution is sometimes 30 seconds long. It seems to have very slow periods and then it unfreezes and sort of starts working OK. All other applications work normally over RDP. I tried both suggestions but I got the same behavior. On my remote machine opengl info command gives this output:

>> opengl info

Version: '1.1.0'

Vendor: 'Microsoft Corporation'

Renderer: 'GDI Generic'

MaxTextureSize: 1024

Visual: 'Visual 0x0e, (RGB 24 bits (8 8 8), Z depth 16 bits, Software, Single buffer, Antialias 0 samples)'

Software: 'true'

HardwareSupportLevel: 'none (known graphics driver issues)'

SupportsGraphicsSmoothing: 0

SupportsDepthPeelTransparency: 0

SupportsAlignVertexCenters: 0

Extensions: {3×1 cell}

MaxFrameBufferSize: 0