Witcher 3 - Performance Difference (heroic vs game mode)

Hello there,
I have the GOG version of witcher 3 (next gen - dx12) running on my steam deck with, i would say, good performance.
Installed the game via Heroic and manually added the dx12 exe to steam. All running fine with "Proton Hotfix"
I now wanted to use the cloud save functionality in Heroic and used the "Add to Steam" button. I understand that instead of launching the game directly, it first starts heroic in no-gui-mode and syncs savegames first. But what I noticed is, that when I start the game this way, the performance is really bad. I cant really get it to run with more than 25 fps (regardless of the settings)
In contrast: my manually added version of the game runs with smooth 40fps (i could get higher, but i capped it to get some more battery life out of it)

Is there a setting so that the game - including the sync of savegames - can be run with the same performance like the manually added one?

Regards!
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