Thanks for your help. Here's what you asked :
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$ apt policy firmware-amd-graphics
firmware-amd-graphics:
Installed: 20190114-2
Candidate: 20190114-2
Version table:
*** 20190114-2 500
500 http://deb.debian.org/debian buster/non-free amd64 Packages
500 http://deb.debian.org/debian buster/non-free i386 Packages
100 /var/lib/dpkg/status
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# dmesg | grep firmware
[ 7.316829] r8188eu 3-3:1.0: firmware: direct-loading firmware rtlwifi/rtl8188eufw.bin
[ 33.998016] r8188eu 3-3:1.0: firmware: direct-loading firmware rtlwifi/rtl8188eufw.bin
[ 67.003978] r8188eu 3-3:1.0: firmware: direct-loading firmware rtlwifi/rtl8188eufw.bin
[ 110.020772] r8188eu 3-3:1.0: firmware: direct-loading firmware rtlwifi/rtl8188eufw.bin
[ 162.999855] r8188eu 3-3:1.0: firmware: direct-loading firmware rtlwifi/rtl8188eufw.bin
[ 226.041156] r8188eu 3-3:1.0: firmware: direct-loading firmware rtlwifi/rtl8188eufw.bin
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$ glxinfo -B
name of display: :0.0
display: :0 screen: 0
direct rendering: Yes
Extended renderer info (GLX_MESA_query_renderer):
Vendor: VMware, Inc. (0xffffffff)
Device: llvmpipe (LLVM 7.0, 128 bits) (0xffffffff)
Version: 18.3.6
Accelerated: no
Video memory: 64435MB
Unified memory: no
Preferred profile: core (0x1)
Max core profile version: 3.3
Max compat profile version: 3.1
Max GLES1 profile version: 1.1
Max GLES[23] profile version: 3.0
OpenGL vendor string: VMware, Inc.
OpenGL renderer string: llvmpipe (LLVM 7.0, 128 bits)
OpenGL core profile version string: 3.3 (Core Profile) Mesa 18.3.6
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL version string: 3.1 Mesa 18.3.6
OpenGL shading language version string: 1.40
OpenGL context flags: (none)
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 18.3.6
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
Have you tried any graphically-intensive programs at all?
Yes, 3D graphics in Blender are extremely laggy.
Does the cursor also lag with a different mouse?
Yes, I have 3 mouses, tried them all, they all do the same.
did you search the interweb for a specific solution to that problem
Yes. It didn't help. And I wouldn't expect it to since the issue doesn't seem to be specifically mouse or cursor-related.