I have dx11 app which drops performance on win7 when linked with steam.dll.
App hangs in dx11.device->CreateDeferredContext for ~8ms in ~75% frames in main thread.
No such issue in app built without steam. Also cannot reproduce on win10.
I suspect that Steam hooks DirectX calls and does something to them, like adding additional synchronization or something.
Any help is appreciated.
App info:
- 32 bit app built on Windows 10 with visual studio 2017 (version 15.4.5)
- command buffers with deferred context are created each frame (hang is there)
- Swapchain present mode for Windows 7: DXGI_SWAP_EFFECT_SEQUENTIAL with VSync
Problem environment:
- Lenovo laptop with Windows 7
- NVidia GeForce 840m with 378.66 driver
- DirectX feature level 11.0
- Disabling "steam overlay" in steam client settings doesn't help
- GPU frame time according to performance queries is low (~5ms)
