Ran into this somehow after 4 years 
Can anyone on Linux please check how fluent it feels when changing the size of the spectrum analyzer window as shown here 2023 07 02 16 14 57 - YouTube ?
I have MX Linux (MX-21.3_x64 Wildflower September 18 2022 ) on two machines (Dekstop and Laptop) installed and on both it feels very sluggish In the video it is extreme, because OBS was open.
inxi from the desktop PC
System: Host: fox Kernel: 5.10.0-23-amd64 x86_64 bits: 64 Desktop: Xfce 4.18.1
Distro: MX-21.3_x64 Wildflower September 18 2022
Machine: Type: Desktop Mobo: MSI model: H81M-E34 (MS-7817) v: 3.0 serial: <superuser required>
UEFI: American Megatrends v: 17.5 date: 03/30/2015
CPU: Info: Quad Core model: Intel Core i5-4460 bits: 64 type: MCP cache: L2: 6 MiB
Speed: 3253 MHz min/max: 800/3400 MHz Core speeds (MHz): 1: 3253 2: 3271 3: 3243
4: 3236
Graphics: Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics
driver: i915 v: kernel
Display: x11 server: X.Org 1.20.11 driver: loaded: modesetting unloaded: fbdev,vesa
resolution: 1920x1080~60Hz
OpenGL: renderer: Mesa DRI Intel HD Graphics 4600 (HSW GT2) v: 4.5 Mesa 20.3.5
I also have an AMD Lenovo Laptop and there’s no such issue. Maybe it comes from the Intel onboard graphics.