I've attached a video link below showing the terrible lag when I switch to the Project Media tab. The thumbnails take so long to load that I can't work or use the program at all during that time. In version 22, the same thing happened when I opened the Explorer tab and entered the video files folder. The problem is so severe that it disrupts my work so much that I can't do anything. I've been using Vegas for over 14 years. I've had various problems over that time, but what's happening now is a complete disaster. I'm on the verge of giving up on Magix services. Today I even installed the free version of DaVinci, and what I saw was a complete disaster. Everything works smoothly there and doesn't complicate my work. Can anyone help me? The files I'm using are from an FX3 camera, 4K, XAVC S H.264, 10-bit, 50 fps.