How to get best video performance on Windows VM without gpu passtrough?

I'm using OpenSUSE as my main OS on work laptop (Ryzen 5850U, no additional GPU), however I need to have working Outlook desktop app, since some of our company communications are encrypted using S/MIME, which as far as I know is unsupported in OWA on systems other than Windows. We are using on-premise Exchange server. So I decided to setup Windows VM, I'm using libvirt for this. Here is my VM config:

RDPWindows
  350141fc-4158-43cc-afad-my-uuid
  
    
      
    
  
  8388608
  2097152
  8
  
    hvm
    /usr/share/qemu/ovmf-x86_64-ms-code.bin
    /var/lib/libvirt/qemu/nvram/RDPWindows_VARS.fd
  
  
    
    
    
      
      
      
    
    
  
  
    
  
  
    
    
  
  destroy
  restart
  destroy
  
    
    
  
  
    /usr/bin/qemu-system-x86_64

However I'm getting quite poor video performance, it is *usable* but definitely not convenient to use, so I'm wondering how to get better performance. I tried using https://github.com/Fmstrat/winapps , it gives slightly better performance, but there are visual bugs. I tried RDP with xfreerdp but it wasn't really better than SPICE. I have installed SPICE guest tools on that Windows.