[PC] FPS drops After 1.6.0 Update

I have a problem. EA SPORTS™ WRC update version 1.9. RTX4090 FE video card. Graphics settings 3840 x 2160, maximum quality! You start the race, and in some places in some tracks the game stumbles and slows down, then goes smoothly, then twitches again. If you restart the track, then in those places where the picture used to twitch, now it does not twitch, but begins to twitch in other places along the track. Sometimes the game suddenly goes into smooth mode after starting a track without a single stop, and you can walk to the end of the track without a single stop and stumble! But if you restart the track, the freezes will resume again. Disabling the hardware acceleration of the Win 11 GPU during scheduling does not solve the problem. Using DLSS or disabling it, as well as even switching the quality to ultra-low and 1920 x 1080 resolution also does not solve the problem.!

Add. 1. All the different combinations of vsync, and the "maximum performance" mode, and the "low latency" mode. I even replaced the operating system from Windows 10 Pro to Windows 11 Pro, I bought a new RTX4090 FE video card (previously it was RTX 3080Ti) I did my best, but it did not lead to an improvement in the situation. The only thing I noticed is that in those moments when severe stuttering occurs, the FPS indicator does not fall below 53 frames, but it feels like the frame rate is at the level of 25-30 frames. But the frame-per-second counter shows 53-55 frames per second. Sometimes it seems that the PCI-E bus bandwidth is not enough. But I'm sure there's nothing wrong with the PCI-E bus. No game behaves like this anymore. Although I always set all games to the maximum quality settings and 4K resolution! Most importantly, it is alarming that after several preloads of the route, it may happen that I will be able to complete the entire route without a single stumble. And this is with maximum graphics settings! But once you restart the track again, there are jerks again, which alternate with smooth passage. It looks like this: smoothly, jerkily, smoothly, jerkily!

Add. 2. Any other games with maximum 4K quality on the same TV, which I use as a huge monitor, give a great game without the slightest twitch (v-sync is enabled).

Add. 3. I noticed an interesting behavior. There is always a slowness at the beginning of any of the tracks! It feels like FPS = 30, but I'm sure it's a glitch in the game because the FPS counter shows 60. So, if at this moment you go into the graphics settings and change any of the values, then exit the settings menu even without saving (!), then the slowness disappears and the game goes smoothly! Then, in some rare places, there is a slowdown and jerks, which I wrote about above, but this trick with the settings no longer works!.
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 i9-10980XE 5.1GHz = All 18 Cores | Asus Prime X299 Edition 30 | Alphacool Eisbaer Pro 420 | 64 GB G.Skill x 4 chan | nVidia RTX 4090 FE | 970 Pro 1TB + 980 PRO 2TB + WIN 11 Pro 23H2 22631.4169. | nVidia 561.09 - V-Sync = ENABLED | SONY XBR-75X950G 75' Display HDMI Connect