The Lumetri Color panel has a 3- to 4-second delay

The Lumetri Color panel has a 3- to 4-second delay.I always work with footage from a Panasonic S5, and video editing always runs smoothly. Now I’ve received footage from a Sony Alpha 7S III, and my Color panel is running slowly. The video bitrate is 143 Mb/s, and I thought that Premiere simply doesn’t handle Sony camera files well, so I created proxy files. I chose “MP4 Half,” but the problem persists. How can I get Premiere to work quickly with footage from the Sony camera? With Color Match, I have to wait 10–15 seconds, and that's not how the program is supposed to work. Right now, my proxy file is: Video: MPEG-4 Video (H.264) 1920x1080 23.976 fps 10,470 kbps. Let me add some more info. The entire project interface is lagging. Does Premier really work that poorly with Sony files? When I open a Panasonic project at the same time, everything runs smoothly and quickly. The magic of Adobe! I’ve already set the quality to the minimum, but the interface is still very laggy—I’m even having trouble drawing a mask.