Abnormal game launch speed #55

Every game launch through the NotProton has a fixed ~38 second stall between pressing Play and the game executable being spawned. I'm not familiar with Wine so I used AI agent to help me analyzed this issue:

The stall is inside the
steam.exe shim's run_process() unix→DOS path conversion, and it ends exactly when
err:ole:start_rpcss Failed to start RpcSs service is printed. CPU during the stall is
~0 % — it's a service-start timeout being paid on the critical path, not slow emulation.

Press Play → game window is ~50 s total: ~9–12 s run-script preamble (which I understand
is being addressed in the dev branch, #19/#21), then this ~38 s stall, then the actual launch.

I'm using NotProton 1.0.3 with CrossOver Preview 20261006 arm64, I didn't try the x86 CrossOver yet and this issue does not exist when launch the game with Windows version of Steam. I chose to use unstable arm64 ver because some of my games only work well on arm64 bottle.

Here are the evidences:

l4d2-550-notproton-wine.log

th06-4659620-notproton-wine.log

steam-console-launch-timeline.txt

trace-37s-gap-short.log

control-dos-path-no-stall.log