Radeon RX 5700XT & Latest Zwift is low performance

The previous version of zwift output about 100fps with Radeon RX 5700XT.
However, after the release of Yorkshire, the performance dropped to about 30fps in the same environment.
GPU usage is only about 55%.
I have tried several Radeon drivers and the results are the same, so I think the performance degradation is due to the zwift application.
Does this happen on other Zwifters?
I want to know what is necessary to get the GPU performance that I want.

Game Version: 1.0.39812
Launcher Version : 1.0.44
Radeon Software Version 19.7.5 / 19.9.1

Just for laughs, what happens if you start the game, then disconnect you networking? Does your fps go up? And what happens if you go into ‘just watch’? My fps has dropped recently in groups but my CPU and GPU show pretty low utilization 35% on the busiest core / 65% GPU load. The GPU isn’t being pushed and I have no idea where the bottleneck is. Could be DDR3 1333 MHz RAM, but I doubt it as it was fine up until a couple of months ago.

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Low performance is the same for both network disconnection and “just watch”.