web version is blurry but the only version that I can I can use virtual background

When using the app version zoom on my desktop I can't use the virtual background, but I can on the web version. The web version is SO SLOW but the app on my pc is so much faster! The error code I get when trying to add a virtual background to the app version on pc is that my equipment doesn't support it. I have a brand new Logitech webcam 4k.