https://bugs.documentfoundation.org/show_bug.cgi?id=152657

            Bug ID: 152657
           Summary: Extreme slow graphical performance and laggy behavior
                    with LO Calc 7.4.3.2 on Linux Mint 20.3
           Product: LibreOffice
           Version: 7.4.3.2 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: libreoffice-bugs@lists.freedesktop.org
          Reporter: lp.allar...@gmail.com

Description:
Due to a plethora of critical bugs in 6.3 I upgraded to 7.4.3.2 from TDF
packages on Mint 20.3.  Calc's performance is extremely sub-optimal and I
experience heavy lagging and slowlyness while navigating my spreadsheet.  A
good example is if I hit the down arrow on my KB to send the cursor down and
maintain the key pressed for 10 sec, Calc will continue scrolling down in the
sheet for a solid 30 sec after I release the down arrow key indicating extreme
system overload and bad responsiveness.  CPU is also maxed out.

Starting LO with "SAL_USE_VCLPLUGIN=gen libreoffice7.4" resolves these issues
and performance is pretty much as per previous releases.

I tried disabling antialias, hardware acceleration, OpenCL, multi-threading,
etc to no avail.

Steps to Reproduce:
1. Launch Calc
2. Open ODS file
3. Experience extreme performance issues

Actual Results:
See description.

Expected Results:
Native performance


Reproducible: Always


User Profile Reset: Yes

Additional Info:
System:    Kernel: 5.4.0-135-generic x86_64 bits: 64 compiler: gcc v: 9.4.0
Desktop: Xfce 4.16.0 
           tk: Gtk 3.24.20 wm: xfwm4 dm: LightDM Distro: Linux Mint 20.3 Una 
           base: Ubuntu 20.04 focal 
Machine:   Type: Desktop Mobo: ASUSTeK model: M5A97 v: Rev 1.xx serial:
<filter> 
           BIOS: American Megatrends v: 1605 date: 10/25/2012 
CPU:       Topology: Quad Core model: AMD Phenom II X4 965 bits: 64 type: MCP
arch: K10 rev: 3 
           L2 cache: 2048 KiB 
           flags: lm nx pae sse sse2 sse3 sse4a svm bogomips: 27290 
           Speed: 3400 MHz min/max: 800/3400 MHz Core speeds (MHz): 1: 3400 2:
3400 3: 3400 
           4: 3400 
Graphics:  Device-1: NVIDIA GP108 [GeForce GT 1030] vendor: ASUSTeK driver:
nvidia v: 470.161.03 
           bus ID: 01:00.0 chip ID: 10de:1d01 
           Display: x11 server: X.Org 1.20.13 driver: nvidia 
           resolution: 1920x1080~60Hz, 3440x1440~60Hz 
           OpenGL: renderer: NVIDIA GeForce GT 1030/PCIe/SSE2 v: 4.6.0 NVIDIA
470.161.03 
           direct render: Yes

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