Alma 9.3 via VirtualBox

There is a problem with the Alma 9.3 guest operating system on VirtualBox (Windows 11 host). AMD Radeon 5700G processor, 32 GB RAM.
The video slows down and the sound is interrupted.
Guest add-ons are installed, virtualization in BIOS is enabled, the latest updates are installed on both systems, Cinnamon as the GUI. In general, the system works fine, problems arise with video calls, for example. htop shows almost full load of all processor cores (4 of them are allocated). Could you help me, pls.
P.S.: Sorry for my English…